Re: Big Mama CNC Mill
seveerz, Sun May 04 2014, 11:43AM

if you had some NEMA 34 steppers & drivers on the bench I'd be even more envious

Re: Big Mama CNC Mill
Sulaiman, Sun May 04 2014, 01:39PM

easy !

it's an electric pogo stick

Re: Big Mama CNC Mill
Dr. H., Sun May 04 2014, 06:36PM

Hi guys

seveerz is now better ?




I've always went with servos after my very first mill. Those will be with a 1000 ppr encoders.

Hmmm electric pogo stick .... should renew my life insurance hee hee Although a really nice idea.

Cheers

Re: Big Mama CNC Mill
seveerz, Mon May 05 2014, 01:25AM

ok encoders mean better resolution no lost step errors. What software will you use, how difficult is encoder decoding integrated to servo pulse control. Don't really know what I'm talking about here but understand the BIG machines do use servos. Have followed some threads on machinist forums, most use steppers which is my plan for my mill. Back to encoders can the data from DRO's be used to get position info this would prevent backlash errors.

Re: Big Mama CNC Mill
Dr. H., Mon Oct 13 2014, 06:35AM

Hi guys

After a lot of parts gathering, design and head scratching this project is finally on the move. It is a big mill with working area of about 1100 x 850mm. It is intended for cutting mainly hard materials.

So here we go - the frame starting to take shape...

Cheers

Re: Big Mama CNC Mill
Dr. H., Mon Oct 27 2014, 07:20AM

The frames are starting to take shape.

Cheers

Re: Big Mama CNC Mill
Linas, Mon Oct 27 2014, 07:58AM

For no reason what so ever, i really need that you finish this as fast as you can, with as little hassle as possible :)

Re: Big Mama CNC Mill
Dr. H., Thu Nov 06 2014, 05:49AM

Moving forward...

Re: Big Mama CNC Mill
Thomas W, Thu Nov 06 2014, 06:34PM

Gosh... this is turning out to be a real monster. I can't wait to see the finished product :D

Keep up with the great work!

Re: Big Mama CNC Mill
Dr. H., Tue Nov 11 2014, 07:19AM

Good day all

Thanks for the nice words Thomas

The X axis starting to take shape.

Best Regards

Re: Big Mama CNC Mill
Mads Barnkob, Tue Nov 11 2014, 09:45AM

That is some hobby undertaking to build a machine that big! One thing that I wondered about, "how are Huben ever going to get that thing out of the house?"

I can see you can take it apart, but that will be some work to align it all when putting it back together, it certainly is easier to just level out a complete machine :)

Are you planning on some more cross beams to stiffen it up from rocking around in the X-axis?

Re: Big Mama CNC Mill
Dr. H., Tue Nov 11 2014, 09:57AM

Hi Mads

Whoops this is the Y axis on the upper picture. About the X axis - a bit more steel is planed to be added. The vertical struts are prone to some rocking due to the nature of the bottom beam. It will be closed and perpendicular beams are going to be added to solve the issue.

When the X axis frame is bolted to the struts the rocking disappears - but just to be safe hee hee.

If you like you can add a picture showing where you suggest more beams - always nice to have constructive feedback.

Cheers

Re: Big Mama CNC Mill
Dr. H., Mon Nov 24 2014, 08:58AM

Hi guys,

the Z-axis is slowly taking shape.

Cheers

Re: Big Mama CNC Mill
Dr. H., Tue Dec 02 2014, 06:42AM

Hi guys,

moving forward

P.S. There is a "good" reason to be on top of the mill - measuring the vertical deflection of the axis .... around 0.005mm with 100 kilos (if you look closely you will see the indicator below the Z-axis) - good enough

Cheers

Re: Big Mama CNC Mill
Justin, Thu Dec 04 2014, 06:20PM

Looking great, I'd love to do something like this when I have a larger workspace, keep up the good work.

Re: Big Mama CNC Mill
Thomas W, Thu Dec 04 2014, 08:10PM

I've packaged up those IGBTs for you, They should be off by friday ;)

Re: Big Mama CNC Mill
Hazmatt_(The Underdog), Fri Dec 05 2014, 03:00AM

Once it's all together, are you going to fly-cut the mounting surface to ensure that everything is true?

I'm just curious how you're going to deal with surface irregularities during your first setup. Like when you get a new machine, you assume that it is true.

Re: Big Mama CNC Mill
Kizmo, Fri Dec 05 2014, 07:25AM

I have been setting up several commercial machining centers over the years and it is amazing how many geometrical problems these things can have. Milling the table surface does next to nothing.

In commercial world we test machines with ballbar test. Results will look like this:



These ballbar tests are usually performed in x-y plane but they can be done in any plane (X-Y (full circle), X-Z(half circle), Y-Z(half circle) )


Here are most common geometrical problems i have seen:

1. Spindles axis of rotation is not perfectly perpendicular to table. This error will cause steps in surface if you have to machine it in several passes. Also surface wont be flat since one side of the cutter is deeper than the opposite. I prefer better than 0.01mm / 200mm diameter circle.

2. Axis are not square to each other. This error is usually most noticeable in X-Y plane. Circles come out out of round and 90 degree corners are not 90 degree and so on. Commercial machines are tweaked until they are 0.005mm/meter

3. Table not being level over the whole travel. This one is hard to measure without precision level. And this is the one that causes table being not flat if you mill it in place. I have seen 0.15mm/500mm twist in 240000euro machines y-axis and it was pain to tweak to manufacturers specification (0.005/500mm)

If i was to build my own machine i would invest into precision granite square ($200 to $300 from ebay). It will help tremendously with setting axis to be square with each other. Also the square has usually 45 degree side so you can perform 45 degree test to ensure that your axis are in balance :)

Re: Big Mama CNC Mill
Dr. H., Fri Dec 05 2014, 03:02PM

Good day guys

Halfdead - thank you for your kind words.
Thomas - big thanks for your help

Hazmatt, Kizmo - those are nice questions and suggestions. Due to budged limitations and not trying to compete with a professionally built machines my standards are a bit lower. I use a indicator clock and a big precision ground right angle. I mount the indicator in the spindle and move it around and correct the axis alignment. I've never built something so big so I am not sure what the result will be at the end. Every "important" surface has been turned on a lathe to ensure flat surfaces for mounting the linear guides. I will be really happy to get into the 0.1-0.2mm error for the whole table.....
One of the big challenges in the moment is that I am making an automatic tool change spindle - so I don't know how accurate that will be .... will see in 1-2 weeks. Plan to make a disk using a lathe, mount on it the indicator clock and screw it in the spindle. Will rotate and aligned to the table. Again will see....

For the X-axis - a hight adjustment is planned(to increase the max height of the work piece from 200 to 300mm) so an adjustment "mechanism" will be incorporated (well... a nut and a bold ) that will also be used for aligning the axis to the table.

For the right angles - I cut a piece of material and measure the angle.

When I have the mill on it's final position, and aligned as best as possible will most likely "mill" the table to make it as flat as possible to the spindle.

This project is more of a learning experience - trying to push the limits of what I've learned through the years from my previous hobby mills. Like building those things hee hee.

Cheers

Re: Big Mama CNC Mill
Hazmatt_(The Underdog), Sat Dec 06 2014, 01:50AM

I would fly-cut the surface rather than using an endmill. I have a heatsink that we fly cut on a large machine and it came out beautifully. We're only taking half a mil off anyway to true-up the surface here, so it's fairly quick and a large 3" pass.

But what Kizmo is saying is that is not going to make a difference, so then should he shim the bottom of the table?
If you have a known parallel mounting plate, I guess shim would be a good answer because you can get precision shim, and the table is a bolt-on so that would be possible.

I've never setup a machine before, I do my best with what I have as well, and I can get pretty good results on non-critical things. I'm learning and practicing as well with my Atlas mill, and getting more tooling for my drill press.

Re: Big Mama CNC Mill
Dr. H., Mon Dec 08 2014, 06:23AM

Hi guys,

What Kizmo is saying (if I understand correctly) is that you must have a true machine (everything is aligned at right angels) and then to shim the surface.

Most likely I will also use fly-cut - depending how much material I have to take off.

Cheers

Re: Big Mama CNC Mill
Hazmatt_(The Underdog), Thu Dec 11 2014, 04:44AM

Before you fly-cut, use a dial indicator and take some measurements. Maybe zero in the center of the plate, and see what the corners read, then repeat the procedure after the fly-cut and see if there is any improvement.

Also, you could use layout fluid before the cut to "see" where you have been, and also you would want to go just deep enough to scratch off the marking, just my feeling on that one.

Re: Big Mama CNC Mill
Dr. H., Mon Dec 22 2014, 07:43AM

Hi guys,

the power supply for the servo motors is ready. It is around 40V 30A total, non stabilized. The box also includes the relays for air, oil, water pumps... soft start and so on ...

Cheers

Re: Big Mama CNC Mill
Linas, Tue Dec 23 2014, 03:11PM

nice "old style" assembly, like in aircraft military equipment

Re: Big Mama CNC Mill
Dr. H., Sat Jan 03 2015, 08:34PM

Hi guys

some progress - the table is mounted, all of the drive motors are mounted, and the spindle mount is ready. Also the limit switches are done. Cheers

Re: Big Mama CNC Mill
Patrick, Sun Jan 04 2015, 04:50AM

thats real nice aluminum plate.

Re: Big Mama CNC Mill
cjk2, Thu Jan 08 2015, 09:34PM

Could you show more detail of the spindle? Did you machine it yourself?

Re: Big Mama CNC Mill
Dr. H., Fri Jan 09 2015, 06:58AM

Hi guys

Thanks for the nice words.

cjk2 - it is a home made automatic tool change spindle for BT30 tappers. Will be posting detailed pics soon but still ironing out some of the mechanical details (waiting for two shims from Germany) and want to be sure it half works before I post it. Stay tuned

Cheers

Re: Big Mama CNC Mill
Dr. H., Sat Jan 10 2015, 08:14PM

Hi guys

as promised here is the assembled spindle. It is an automatic tool change spindle, using belleville springs and ball type gripper. It is built on the heavy side - deliberately using a bit bigger bearings. All of the components of the gripper are heat treated. The bar for the springs is grinded to provide the needed surface. The spindle will be lubricated / cooled by small oil station. A pneumatic cylinder is used for releasing the tool.

Just assembled the spindle and tested with very cheap bearings - the runout of the tool is quite big - about 0.09mm with 80mm long tool. As the tapper face is turned on the lathe I am pretty happy with the results. I usually work with much shorter tools so it should do the trick for now. Most likely will be grinding the face of the cone when I put good bearings (instead of the 7$ per 7209 bearing that I use in the moment ). It is possible that some part of the runout is due to the bearings.

The concept seems to work - it successfully grips and releases the tool. remains to measure and tune the needed pull force in the static position. Also the rear cap will be remade with few changes and from steel as the alu used for this one turned out to be really crappy and the results are really ugly.

This thing turned out to be one of the most difficult parts of the whole build and still has a lot of work to be done to come to the final product.

Ok here goes the pics. P.S. the spindle and mount weigh 31 kilos ....

Re: Big Mama CNC Mill
Hazmatt_(The Underdog), Sun Jan 11 2015, 08:46PM

OH NO! @.@... Ball bearings!?

I hope it works out! I don't want to be an alarmist, but you probably should be using pre-loaded taper bearings for the heavy loads, not ball bearings.

My Atlas uses taper bearings for heavy lateral loading.

Hope it all works out, I want to see this in action.

Re: Big Mama CNC Mill
Dr. H., Mon Jan 12 2015, 08:28AM

Hi Hazmatt

I've been looking at many commercial BT30 spindles and most of them use such kind of bearings (the bt30 holder is quite small). I deliberately used two sizes bigger bearings (the bt holder looks smallish compared to the spindle itself ). I don't plan on cutting steel (or very rarely if the mill is strong enough) so for aluminum and plastics will be plenty.... I hope. I also have spindle with smaller than those bearings cutting aluminum for years using 6 and 8mm tools so I am pretty sure it will work for what I plan to use it. if it doesn't - the bearing bed on the shaft is long enough to put two roller bearings, the housing will have to be re-bored though.

The main issue in the moment is the big runout. Trying to find where to grind it.

Cheers

Re: Big Mama CNC Mill
Hazmatt_(The Underdog), Tue Jan 13 2015, 02:01AM

I'll keep my fingers crossed! I want to see a video of this thing throwing chips!

Re: Big Mama CNC Mill
Kizmo, Tue Jan 13 2015, 01:24PM

To me the bearing configuration looks good. If you want high speed operation at something like more than 5000rpm, angular contact ball bearings are by far most common choice. Nearly all light/medium duty commercial machines have identical bearing configuration.





Angular contact bearings offer best things from both worlds, depending how big the contact angle is, it can withstand very large axial loads




And when you put two bearings back to back like this (spindle bearings come as precision ground pairs), all you need to do is to tighten inner races together and the preload is set. Rest is just fixing the outer races to the spindle housing.

Re: Big Mama CNC Mill
Ash Small, Tue Jan 13 2015, 02:18PM

Taper rollers in the same 'back to back' configuration Kizmo suggests above will last longer between adjustment, ie, they will wear at a slower rate, or, conversely, will withstand greater loading without failing, all other factors being equal.

I'm with Hazmatt on this one. Taper rollers are pretty cheap these days.

EDIT: I've just had a look at the 7209 bearing and it is an angular contact ball bearing, so you should be able to set it up with no runout at all.

Re: Big Mama CNC Mill
Kizmo, Tue Jan 13 2015, 02:32PM

But tapered roller bearings wont handle the speed very well. That is why high speed spindles dont use them very often. Commercial spindles with angular contact ball bearings will last 1000s of hours :) And you dont adjust pair of angular contact bearings. Just tighten them together and thats it.

Re: Big Mama CNC Mill
Ash Small, Tue Jan 13 2015, 02:35PM


That's a fair point, Kizmo. I'm used to slow machining speeds for stainless steel. A 30209 would probably be a good taper roller to use here, but for high shaft speeds balls may well be better.

EDIT: Says in the spec sheet that 30209's are good for max 8000 rpm, but 6000 rpm is preferable.

Re: Big Mama CNC Mill
Kizmo, Tue Jan 13 2015, 02:50PM

You dont want to be anywhere near its rated speed or the life expectancy will drop like stone. Bearings in our 12000rpm machines are rated for 30000rpm.

I work with aluminum and plastics most of the time, very rarely see machines running below 10000rpm :) Even when machining steel i prefer 10mm end mill at 5800rpm and HSM toolpaths to get the metal flying.


This is how i do steel with low rigidity, low power Haas. The 10mm carbide end mill was good for 90 parts :)

Large tools in stainless or other similar material is whole another ball game

Re: Big Mama CNC Mill
Ash Small, Tue Jan 13 2015, 02:57PM


I agree. Pretty impressive stuff

EDIT: I've just checked the max rpm of the 7209's, and it's 6,300 in grease and 9,000 in oil, so not much different to the taper rollers. The load ratings are a lot lower, too.

Re: Big Mama CNC Mill
Dr. H., Wed Jan 14 2015, 06:19AM

Hi guys,

Thanks for the nice discussion. The motor I have won't be able to rotate the spindle at the speed discussed and I am pretty sure it won't be able to get above 4-5k rpm due to balance issues. This is my first spindle and it was a big learning curve. For now the spindle is in the "lets see if it even work" stage. Hope to get the machine moving in the next two three months.
You've seen the frame (welded beams with machined surfaces after that) so it won't be sturdy as a big professional machine requiring big spindle.

Cheers


Cheers

Re: Big Mama CNC Mill
Electroholic, Wed Jan 14 2015, 09:48AM

Pretty sure the off the shelf 7209 are ground for clearance in back to back configuration. Meaning you won't be able to preload then without adding a shim. Still plenty good enough tho. I made a similar spindle using Three 7204, two in front and the one in the back is preloaded with a wave washer.

Re: Big Mama CNC Mill
Dr. H., Wed Jan 14 2015, 10:58AM

Hi Electroholic,

yes - there is a shim between the bearings (because I couldn't find locally I've cut a 0.5mm one on a laser from hardened stainless steel), but there are 7209 bearings that are factory ground with the required preload (light medium ... etc) just they are way off the budget for the moment... at least till the mill is not operational. There are a lot of other problems to solve in the moment .

Cheers

Re: Big Mama CNC Mill
Dr. H., Tue Apr 07 2015, 06:34PM

Hi guys,

progress on the project - the servo motor controllers are ready. Cheers

Re: Big Mama CNC Mill
Linas, Wed Apr 08 2015, 12:19PM

Nice to see that you are getting thumbs up I would call that better achievement than your servo drivers :D

Re: Big Mama CNC Mill
Dr. H., Tue Apr 21 2015, 04:46AM

Hi guys

big progress on the mill. Pretty much most of the mechanical work is finished now. Remaining the control panel and all of the support functions (air, oil water...). After that complete strip down and painting ...

Cheers

Re: Big Mama CNC Mill
Dr. H., Wed May 06 2015, 05:26PM

Hi guys

Air supply is ready. Just waiting for the proper coil for the valve. Finally tested the spindle ATC function - it works as designed. It takes around 5 bars to loosen the tapper (100mm piston) and up to 9 bars to fully detach it from the gripper. Tested the supply up to 12bars just to be sure that nothing will explode. Plan to set it around 10 bars. Also added a pressure regulator for a air pistol.

Cheers

Re: Big Mama CNC Mill
Dr. H., Fri May 08 2015, 06:45PM

Hi guys

Water cooling is ready


Best Regards

Re: Big Mama CNC Mill
Dr. H., Sun May 10 2015, 05:39PM

Hi guys,

some important progress on the mill - the spindle is pretty much complete now. I did a fast dry run of it - no vibrations, quite enough at around 3k rpm Also I've finally fine tuned the ATC function - . The tapper is separated at around 400kg of force, and fully released at around 900kg.

The power supply and the controller for the motor remain to be done.

Hope you like the vids

Cheers

Re: Big Mama CNC Mill
Dr. H., Thu May 21 2015, 06:42PM

Hi guys

moving forward with the control panel. It came out really nice in my opinion

Cheers

Re: Big Mama CNC Mill
Justin, Fri May 22 2015, 05:39AM

Looking great!
Is this an open source project?

Re: Big Mama CNC Mill
Mads Barnkob, Fri May 22 2015, 12:05PM

It is not just in your own opinion that this came out nice, you are building top quality DIY parts :)

Re: Big Mama CNC Mill
Hazmatt_(The Underdog), Sat May 23 2015, 05:24AM

totally amazing man!

Re: Big Mama CNC Mill
Dr. H., Wed Aug 12 2015, 04:53PM

Thanks for the nice comments guys

Ok .... soo looong time since I've posted - a bit of health issues so going slow.... dissasembled everything, precision ground few parts, painted everything and started putting it together. Centering and leveling takes FOOOOREEEVEEER .... it took 3 days to square the Z relative to the X, make all of the linear guides paralel to each other, and fine tune the lead screws. Remains the Y axis to be adjusted but a small problem with the frame turned up - so a bit more heavy machining will be needed.

Because of some comments in the past here is how I tackled the problem of making the axis square to each one. I am using a machine grade square level and precision 90 degree angle.





And some "fine"positioning of the frame (this is just a test to see if I can achieve square angle or there is something wrong).

Re: Big Mama CNC Mill
Dr. H., Mon Aug 17 2015, 11:20AM

Finished the box full of air... After some testing it became clear that the inside was getting really hot due to the compressor - so I've added a fan to cool it down. Cheers

Re: Big Mama CNC Mill
Dr. H., Tue Aug 18 2015, 05:28PM

Hi guys

today i've rebuilt from scratc the oil pump for the spindle. The old one was dirty, and leaking oul all over the place. Also wanted a bigger volume container. By accident I found a real nice stainless steel container in the scrap yard so I went for it. After a full day of work this came to life . Cheers

Re: Big Mama CNC Mill
Dr. H., Fri Sept 11 2015, 04:20AM

Hi guys,

small update - built the spindle backlight.

Cheers :)

Re: Big Mama CNC Mill
Linas, Fri Sept 11 2015, 01:05PM


Keep the good work :)

Re: Big Mama CNC Mill
Dr. H., Tue Nov 03 2015, 05:56PM

Hi guys

long time no see. I've been working hard on the control panel and finally it is ready now. It has a USB keyboard emulator, modbus interface, complete standalone control over the machine (no PC needed) - for those little on the fly stuff, DROs..... This is a really big milestone for the project .... it took forever and I thought I would never finish it ..... Few more final touches and ready to connect to the machine and try to move the beast.

Cheers

Re: Big Mama CNC Mill
Dr. H., Fri Jan 01 2016, 08:05AM

Hi guys

just before New year I finally got the spindle rotating with the final setup. Left it runing at different RPMs for about 10 hours. Seems to be working reliably.

First of all BIG thanks goes to Linas and Thomas W. for helping out with acquiring the high power parts.

The motor is controlled by a PID regulator. Feedback is with optical sensor and slotted wheel. Power supply is big old three phase transformer, rewound for the needed voltaga.

The biggest advantage of this setup is the ability to run at low RPM (currently min is 200) with very high torque. The down side is the complexity and the high currents (under very heavy loads up to 100A...) and the fact the motor is noisy due to the big amount of air forced through it and the brush mechanism at high RPMs.

The maximum RPM is about 4500. I've limited it to 4000. Above 4200 some disbalance issues appear with the homemade spindle.

So here are the pics.

Cheers and Happy new year.

Re: Big Mama CNC Mill
hen918, Fri Jan 01 2016, 12:15PM

Half of the machines in our shop (Mazaks, Kitamuras, Haases, etc...) aren't as well designed or as well built as your miller.
Well Done!

Re: Big Mama CNC Mill
Dr. H., Mon Jan 04 2016, 07:45PM

Hi guys,

hen918 - thanks for the kind words. Been designing/building this thing for about two years now.

Ok so... BIG update - first movement of the exes. Few problems on the way though, managed to kill one servo controller due to very high motor currents and oscillations. There ae few more problems for ironing out but it wooooorks .



Cheeers

Re: Big Mama CNC Mill
Karmaslap, Wed Jan 06 2016, 01:14AM

Great Job! It's a very cool project! Shame about the controller, but at least you should be able to fix the problem now and save others in the future.

Re: Big Mama CNC Mill
Dr. H., Fri Jan 08 2016, 05:35PM

Hi guys,

thanks for the kind words The death of the controller was due to wrong PID settings and wrongly set current limit ... whooops.

Ok sooo - here we go - finally cutting some aluminum.

Slowly for now. The machine seems to preffer deeper slower cuts instead of high speed machining (low RPMs of the spindle is the limiting factor here).

Few glitches and problems to resolve but it seems to be runing quite stable now.

Best Regards

Re: Big Mama CNC Mill
Mads Barnkob, Fri Jan 08 2016, 06:36PM

Congratulations on the metal milling!

How far down is your tolerances between what you programmed and what you cut?

Re: Big Mama CNC Mill
Dr. H., Sat Jan 09 2016, 05:38AM

Mi Mads,

a bit high. Without a finishing pass (... know, but I was in a hurry to mill something ) - 35mm diameter is milled 34.85mm. This is with old unknown tool and with spindle that is not centered. I guess with a finishing pass I will get closer to the final diameter (I suppose few hundreds are due to tool and frame deflection under the heavier cutting load). I am very pleased with the surface finish though. It is very flat to the touch.

Suggestions are welcome .

Best Regards

Re: Big Mama CNC Mill
Hazmatt_(The Underdog), Sat Jan 09 2016, 05:44PM

NICE!

What is your first major project going to be?

I just got my metal lathe a couple of months ago and I'm busy tooling that thing up for all kinds of projects.

If you need a really fine surface finish, you can fly cut. One tooth will provide a more even surface then two, and just take a half-mil pass and it will produce confetti, while leaving the surface very finely finished.

Re: Big Mama CNC Mill
Dr. H., Sat Jan 09 2016, 06:11PM

Hi Hazmatt.

Thanks for the nice words and suggestions. Have to find/build a fly-cutter. We did a very fast test at cutting mild steel. With old 8mm tool at 0.7mm depth and 200mm feed seems to be doing really well

First project ... hmm already milled the housing for the spindle backlight

It turned out quite good. took about 1hour (including setup time, tool changes etc.) - good in my book - can't compare with professional machine . This would have been a full day job on my previous mill haa haa.

Re: Big Mama CNC Mill
Dr. H., Wed Jan 27 2016, 04:26AM

On the move .... it took a big van and an estate car full to the brim with stuff to move it ...

Cheers

Re: Big Mama CNC Mill
Chris Cristini, Wed Jan 27 2016, 06:00AM

Awesome work DR H looks allot better than my attempt to a 3D printer with servo's and induction heat. I wish I could do nice work like that especially since that kind of thing is my job.

Re: Big Mama CNC Mill
Dr. H., Wed Feb 03 2016, 09:37AM

Thanks for the nice words

Finally the mill is on its new work place. A lot of work went into properly aligning it and tuning the servos a bit more. The accuracy have greatly improved and in general works better than before

And here is the man who made this project possible - my father.

Best Regards

Re: Big Mama CNC Mill
Linas, Wed Feb 03 2016, 01:57PM

This is very dad looking dad you have here :) It's always good to see father and son working for the same goal :)

Re: Big Mama CNC Mill
Finn Hammer, Wed Feb 03 2016, 11:36PM


Those are the eyes of a very proud father, and he has a lot to be proud of!

Cheers, Finn Hammer

Re: Big Mama CNC Mill
Dr. H., Fri Feb 05 2016, 05:26AM

Thank you very much for the nice words guys