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Old 06-05-2016, 04:15 PM   #1
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Default CNC x2 Mill

I'm finally getting around to designing and building my x2 mill! Been kicking this can down the road for a long time.


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Old 06-05-2016, 04:19 PM   #2
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Default Mill as it is now

State it's in now.


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Old 06-05-2016, 04:21 PM   #3
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Default The plan

How it should end up if all goes as planned
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Old 06-05-2016, 04:24 PM   #4
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Default First picture in virtual world

Close up of motor standoffs in first picture in design
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Old 06-05-2016, 06:19 PM   #5
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Looks good. Keep us posted.
You may want to consider replacing the solid coupling between the motor shaft and the lead screw with a flexible coupling at some point. It reduces any problems with shaft misalignment and keeps the motor bearing and the lead screw bearings from fighting with each other. Not that the solid won't work. Just makes life easier and often increases available power. Easy to obtain on Ebay to suit shaft sizes. Inexpensive if you shop around.
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Old 06-05-2016, 07:54 PM   #6
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Unfortunately Gail, the only type of coupling to give total out of line control (within reason) is the Oldham Coupling.

These couplings automatically realign themselves by offsetting the acetyl disc whilst turning and cut out any side loads onto the bearings at each end.
I have been using them for many years with no problems at all.





In the UK you can easily purchase them from here, but you might also find them on auction sites.

http://www.arceurotrade.co.uk/Catalo...dham-Couplings

The type you have shown, will still allow side loads to the bearings even though they will allow you to connect to the two shafts, it is the deflected bend that does it, with the coupling trying to straighten itself out all the time.

If you are up to it, you can make Oldham Couplings yourself, but taking account of the time involved, it pays to cough up the cash and buy them.

BTW, if you can't get the correct sized ends for the shafts you are using, you can enlarge the centre hole, BUT ONLY BY BORING, otherwise if you just open them out with a drill, the holes can wander anywhere.
DAMHIK

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Old 06-05-2016, 08:06 PM   #7
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Just two cents worth - I snapped a couple of the spring type couplers with table direction changes - Got the little spider type coupling - So far it's Me Proof . . . That, or I'm not trying hard enough to break it .

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Old 06-05-2016, 08:21 PM   #8
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John,
You are correct. The Oldham type coupling is far superior to the spring type that I showed.The spring type is OK for VERY MINOR misalignments and is a definite improvement over having a rigid type coupling. I showed it because it is inexpensive and very available in my world. But I agree the Oldham is a superior coupling.
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Old 06-05-2016, 09:39 PM   #9
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It's not really solid. I'm going to most likely buy one but designed one just in case. Doing some more machining today but it's hot in the shop....so hopefully have some more pics up soon.
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Old 06-05-2016, 09:40 PM   #10
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The one I designed looks remarkably like the one in blogwitch's pic.


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