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thanks for the kind replies Yep it is built to last. I've decided on forced oil because that is the manufacturers reccomendation for those types of bearings. They are sad to work at 12k RPM. The motor I am using is capable of runing it up to about 6k RPM (looking for a bit bigger/faster motor). But in most cases it will be running in the range of 2k RPM. Also from past experience with spindles they tend to get quite hot after a while under hevy loads and high RPMs.
P.S. Working on a power supply for the spindle motor in the moment. Pics soon.
Registered Member #2261
Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581
I was comparing it to my mini lathe headstock which uses grease. It looks similar but only runs at up to 2500rpm and the lathe's only manual. Do you use a preload of some sort on the bearings?
I was 4 days home so I had a bit of time to work on the project. I've built a power supply to run the spindle motor. I've used what ever I had on hand. First run is approaching
IntraWinding - sorry for the late reply - I've missed your post - yes there is a nut on the shaft to adjust the preload.
most of the stuff is ready (I am "fighting" with the electronics in the moment and that is the last big thing left). I really hope to get it going till the beginning of the summer (I am not home and can't work on it a lot - only in the weekends when I get home).
P.S. But sure is fun to be able to work on the electronic stuff if the dorm hee hee
after quite a bit of work the electronics are finally ready. All of the safety features are working and the servos are turning fine now. I've finally got one axis of the mill moving but there is still a lot of tuning to be done on the servos. Hope to get all of the axis working in the next few days. First cut is in sight
I've spent most of the morning and big part of the afternoon fixing a problem with one of the axes - it is OK now. I've mounted the spindle and wired the limit switches. Also tested the power supply for it for about 30mins ... no problems there Tomorrow I have more work to do on the Y (mostly adjusting things and fixing small problems).
after almost 9 months of build time it finally started cutting A few problems have shown up but nothing critical. I've spent about 3 hours testing different tools and different feed speeds and RPMs - starting to collect data . I was amazed how well it handled 8mm end mill at 100/min feedrate and 1mm deep groove in aluminum - it cut really nice. No real code for now - just a fast test program I wrote to cut a square out of plexy. Other tests were done with manual feed on the PC.
things remaining -get the cooling system working - get the oil system working - build an RPM meter for the spindle
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Huben,
This has been one of the greater projects this and last year, and you are the man! No end to the fine curved parts you are going to spit out from now on! A "Hats off" from this Danish Toolmaker.
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My new CNC - COMPLETED
Yep it is built to last. 
