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small mill project.
I got a small used cnc mill a year or 2 ago and have not had a chance to go through it and fix it up. The ways (sliding surfaces) look really good - but most everything else needs a little TLC. (ball nut mounts not parallel to the slides and such)
The mill is torn down to its individual parts and being gone through. Currently working on the Z axis slide. Again - the sliding surfaces look great - but the mating surfaces are a bit off.
What to do.. Mount it on the big mill of course!
http://electronicsam.com/images/mats...24_195027R.jpg
Using some ground rod/123 blocks to make sure the ways are parallel and perpendicular to the K&T.
http://electronicsam.com/images/mats...24_195059R.jpg
True up the mounting surfaces... (took off about .002")
http://electronicsam.com/images/mats...624_200623.jpg
And done..
http://electronicsam.com/images/mats...24_202552R.jpg
Things to do yet on the Z axis column..
- mill the relief for the ball screw nut further. (go into the more later)
- mill the mounting holes so they are symetrical. (they are all over the place.)
- mill some line up edges for mounting to the base. (I am adding a 4 inch riser block so there is more space between the spindle and the table)
I think that is it for now.
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Re: small mill project.
This is what really set off the 'go through'
http://electronicsam.com/images/gree.../ballscrew.jpg
The x axis ball nut block was not mounted parallel to the ways. (poor thing) and the more I dug into it - the more little problems there was. (not unexpected - this was a prototype)
This should be one solid machine once I am done.
sam
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Re: small mill project.
Found a chunk of cast iron (part of an old grinder..) to make a 4 inch riser. (this is to raise the Z column)
I needed a piece about 7"X5"X9".
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Started on the base (y axis)
mounted it similar to the vertical column.. Then trued the feet to the ways then cut some reference points..
http://electronicsam.com/images/mats...706_180919.jpg
http://electronicsam.com/images/mats...706_155102.jpg
Now - flip it and make some measurements and reference points.
http://electronicsam.com/images/mats...706_185707.jpg
http://electronicsam.com/images/mats...706_194434.jpg
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4" Riser block kit... slight machining required. .. ;)
http://electronicsam.com/images/mats...707_121142.jpg
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Re: small mill project.
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Re: small mill project.
Kinda like watching paint dry.. Guess I should work on some other things..
http://electronicsam.com/images/mats...707_142525.jpg
it is 'squared'... Now on to machining...
http://electronicsam.com/images/gree...e/DSC_8122.JPG
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Re: small mill project.
the base and vertical off the mill.. I am happy so far.
http://electronicsam.com/images/gree...10_174652R.jpg
Now on to the riser block...
Mounted - once I get a side flat - it should be easier to square up. I can rotate the table and do 2 sides with one setup - which makes them very square.
http://electronicsam.com/images/gree...10_185128R.jpg
First cut..
http://electronicsam.com/images/gree...710_190604.jpg
First cut finished... Going to have to take maybe another .05" or so.
http://electronicsam.com/images/gree...710_192337.jpg
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Re: small mill project.
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Re: small mill project.
Other side roughed..
http://electronicsam.com/images/gree...e/DSC_8132.JPG
Some progress... :) I think I am going to make the over-all riser 5 inches.. (I can always make it shorter...) The column side is done. It fit together perfectly.. Very happy.
Table rotation for finishing up the angles..
http://electronicsam.com/images/gree...812_121257.jpg
finished end..
http://electronicsam.com/images/gree...812_123240.jpg
Like a glove... (back)
http://electronicsam.com/images/gree...812_140623.jpg
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Re: small mill project.
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Re: small mill project.
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Re: small mill project.
Finally got the little mill back on the big mill.. took a bit if finesse to level/square the base/Y axis. (without warping the casting..) We have a .0005"/10" level that works very well for these situations.
Currently the column is <.001 square over its distance. (both directions..)
http://electronicsam.com/images/gree...831_162717.jpg
sam
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Re: small mill project.
Now to get the rest lined up...
http://electronicsam.com/images/gree...902_162643.jpg
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Redoing oil lines.. It didn't have metering valves and the Y axis ball screw was never plumbed..
http://electronicsam.com/images/gree...903_110554.jpg
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I hate plumbing.. Getting there with a few side trips. Had to mount the X axis ball nut. It was so out of square that I machined 2 new holes instead of trying to use the existing 4 holes. (also made it easier to mount with the oil plumbing.)
http://electronicsam.com/images/gree...903_154610.jpg
Checked clearance with the table...
http://electronicsam.com/images/gree...903_154423.jpg
Another view.
http://electronicsam.com/images/gree...903_154721.jpg
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Good enough.. (if it works)
http://electronicsam.com/images/gree...904_190133.jpg