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| RussellT:
Thanks John B and David. Clearly the plywood will have to be replaced at some stage. We all know how plywood rots and delaminates :lol:, but a permanent version is not at the top of my priority list. No new materials were harmed during this project. The 3/8 rod I tried for the slides was previously unused stock but I got it free with the lathe some years ago so I don't count that. An old cordless drill was ideal for this project. Another aspect I hadn't mentioned is that the screwdriving clutch is set to minimum and it drives the table quite happily, but if it reaches the end of the travel then the clutch slips. At maximum speed it feeds the table faster than I can wind it by hand and it'll slow down to less than 2 ipm before it stalls. At that slow speed though it's clear that the alignment still isn't perfect as there is some variation in speed with each rotation of the feed screw. I have some ideas how to improve that. :scratch: Russell |
| John Rudd:
Russ, to get over the misalignment issue causing the speed variation, you need an Oldham coupling fitting between the motor and lead screw....this should take care of any misalignment issues |
| RussellT:
Hi John As it happens I have an Oldham coupling on a salvaged motor, but that would be a last resort because the space it takes would need a complete redesign. Actually the speed variation probably isn't enough to worry about - except for the fact that I have perfectionist tendencies. This is one of the reasons I made the motor position adjustable, so I may be able to improve it by more fiddling. I don't intend to do that until last. It would be wasted time if I then had to dismantle it. However at the moment the shafts are fairly well aligned and if I disengage them completely I don't see more than a fraction of a millimetre misalignment in any position I've tried. That tells me that the problem is probably that the outer end of the drill motor is out of position and the issue is when there is a bending load on the joint. If adjustment doesn't work I could also probably sort that out by putting a slight taper on the shaft that slides into the drill spindle. It would still be located by the full diameter at the end but would have some freedom to move under bending loads. I have more ideas, but I'll leave them for now. It is possible to overthink these things. :loco: Russell |
| ieezitin:
Dammit man……. That mills like black hole for recycled parts, they get scooped in spiral down never to be seen again.. :bugeye: Nice project… well done. Anthony. |
| RadRod67:
Very cool. |
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