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SIEG X2 Y Axis Power Feed Idea
MetalMuncher:
--- Quote from: efrench on August 03, 2015, 01:48:04 AM ---A GT2-3mm 50 tooth gear OD would be about 47mm. You would probably need to remove the hub and put set screws through the teeth. SDP-SI part A 6A55M030NF0912
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Thanks! Putting setscrews through the teeth was my plan, as the exposed 20mm dia. surface with the collar removed from the handwheel is only 11mm wide. This one looks like I could make it work.
Am I correct in thinking it wise to use a flanged pulley on the motor, to keep the belt from wandering off the pulleys, or is that not necessary on relatively slow speed arrangements like this? I don't yet know the output shaft diameter on the motor I'll use to drive this, but the pulleys will need to be the same diameter if I use the powerfeed controller mentioned above, so there won't be a change in speed from what it produces.
MetalMuncher:
--- Quote from: Swarfing on August 03, 2015, 10:07:45 AM ---Make sure you have a disengage of motor arrangement, as not to end up with a nice little generator to fry your electrical's if you keep the hand wheel.
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Thanks! I'll keep this in mind. :)
efrench:
A keyway would probably be better than the set screws. A single flange on each pulley on opposite sides would be the minimum needed. I'd use double flanges on each unless there's a reason for using fewer.
MetalMuncher:
--- Quote from: efrench on August 03, 2015, 12:50:29 PM ---A keyway would probably be better than the set screws. A single flange on each pulley on opposite sides would be the minimum needed. I'd use double flanges on each unless there's a reason for using fewer.
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Although a keyway would be nice, I am not equipped to go that route. And there is insufficent stock for that to work, with my requirements for a <50mm OD yet using a 20mm bore on the pulley. The X Axis power feed I've been using for years employs a coupling with setscrews, and it has never presented a problem. Making a small flat for the setscrews is doable, and would help the pulley not slip on its mount.
If I can find a pulley with flanges that I can make fit on the 11mm of shaft length I have to work with I would prefer to go that route. I believe some of the notched timing belts are made rather narrow. It may be possible to use a pulley wider than 11mm but have the hub milled to only 11mm thick. I would have to do some more measuring to see what clearances I've got on either side of the proposed pulley when mounted. Also, I need to inspect the Y axis leadscrew support piece bolted to the face of the base casting. It may be thicker than absolutely necessary, allowing for removal of some stock to widen that 11mm restriction adjacent to it. It's been too long since I had the mill apart to recall how that piece is machined.
efrench:
sdp-si has CAD drawings of the pulleys, so it should be easy to see how to modify them to fit.
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