Thread: Mounting motor under table?
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01-09-2011 #1
Assuming there are no clearance issues with the table/nut, are there any disadvantages to mounting the motor under the table, parallel to the leadscrew?
Another of my soon-to-be-infamous-for-low-quality example images:
(not sure if the picture worked, ISP is being a pain today)
I'm hoping that a pulley system of some form would be suitable to belt-drive the leadscrew from that location.
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01-09-2011 #2
IMO I dont see any problems with mounting as drawn as long as the spindle protudes enough for a pully, and I think it keeps things tidy.
Jim
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01-09-2011 #3
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01-09-2011 #4
You could mill a pocket in the shaft side of the aluminium to accommodate the pulley if there is not enough space.
Pulleys are definitely good plan as they will let you change the ratio allowing the stepper motor to be put in the right region of the speed/torque curve. You can also swap them round to get more resolution if required.
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The Following User Says Thank You to Jonathan For This Useful Post:
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01-09-2011 #5
This is similar to what i did with my first machine.
http://www.mycncuk.com/forums/attach...2&d=1269125465
Plenty of pics on my build
http://www.mycncuk.com/forums/showth...tempt-Of-A-CNC
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03-09-2011 #6
Sorry for the delay in replying. Had ISP issues for a few days and my posts seem to intermittently require moderator approval (though I think it's when the post includes links).
Jonathan: I think I'll be looking at some kind of pocket, but I still haven't started to research the pulley systems yet so I don't know what I will need in terms of size and clearance.
AdCNC: Awesome build. This axis isn't fixed to the main structure though, it will be the X axis unit mounted on the Y axis.
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04-09-2011 #7
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04-09-2011 #8
Fair enough, so until I settle on a firm number I'll pencil in 1 1/2" clearance from the surface of the mounting block for the pulleys. I suppose judiciously placed idlers would also help with increasing the engagement with the belt.
Is belt something that can be shortened easily, or will I be confined to designing around what is available?
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05-09-2011 #9
Idlers shouldn't be necessary. I made the mount with the holes for the stepper motor slotted to allow tensioning the belt and different size belts and pulleys.
You can't change the lengths of timing belts - the only way is to buy a different length. You can work out the length with something like this:
http://www.sdp-si.com/cd/default.htm
Also:
http://bearingstation.co.uk/products/Belts
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04-09-2011 #10
Just to prove how slowly my brain works... by 1/2 wide do you mean I need to accomodate a diameter of 1/2", or it will protrude 1/2"(+bit sticking out for setscrew) from the mount?
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