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Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
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.
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 .
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 ...
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.
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.
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Big Mama CNC Mill
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I would call that better achievement than your servo drivers :D
