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Post by agatewhisperer on Mar 21, 2021 20:23:15 GMT -5
Hey everyone, pretty basic question but please get out the "big crayon" for me please. I picked up an old beacon star holiday 6 inch machine a while ago and got around to playing with it. The bearings seemed ok and everything seemed pretty modular so I got a new diamond wheel for it. My goal is to get this unit set up with an 80 and 220 grit diamond wheel but want to see if everything works well with the one wheel first. Question is, what do I need to do to tighten the wheels and spacers against each other on the shaft? One of the spacers has a set screw so I just tried pushing all of the spacers and wheel together on the shaft and then locking that spacer in to place. In the picture, everything is pushed firmly against the left hand bearing. When I start it up, the shaft starts spinning before the wheels and takes a few seconds for everything to "catch up" to the shaft speed. Hope that makes sense. Is that normal? What would you recommend to tighten things up? I know the picture looks like there's a gap on the left side of the wheel but there's a smaller spacer in there. Just put some pieces on there to see what would happen. The wheel and spacers can turn if I pushed them by hand when the unit is stopped. So I know they aren't super tight, just not sure the best way to do that.
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Post by parfive on Mar 21, 2021 21:49:44 GMT -5
Fashion some rubber washers out of gasket material and fit them between the wheels and spacers.
When you compress the whole stack before you tighten the set screw, there should be enough friction in there to avoid your problem.
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nik
spending too much on rocks
Member since May 2019
Posts: 315
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Post by nik on Mar 22, 2021 4:15:49 GMT -5
If at all possible, try to avoid putting much axial load through the bearings. It will drastically shorten their life. If you can make space for them on the shaft, some clamp collars would make good stops on the shaft. I prefer the pinch type to set screws, because they will not damage the shaft.
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brotherbill
spending too much on rocks
Member since October 2018
Posts: 368
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Post by brotherbill on Mar 22, 2021 10:01:04 GMT -5
I am not familiar with this model so I may just be talking out my a*#. Take NDK's advice, no axial load on the bearings. This can be achieved by locking collars between the wheel(s) and the bearings (both sides). My bush fix for creating sufficient friction to drive the wheel(s) would be to add a spring on the arbor. I would suggest something akin to the spring on a spring loaded variable speed pulley.It may require a bushing as the ID is around an inch. Good luck
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Post by agatewhisperer on Mar 22, 2021 20:51:31 GMT -5
Thanks for the feedback. I'll see if I can get some of those clamp on shaft collars and place one in each side, and then squeeze it all together before tightening down. Also need to get that second wheel but wanted to make sure this set up would actually work before putting too much in to it.
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Post by agatewhisperer on Mar 23, 2021 6:37:27 GMT -5
Any advice on exactly what kind and where to get one of those clamp on collars? I see a lot online but I'm a little worried they're going to rust, and the stainless ones seems super expensive...
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nik
spending too much on rocks
Member since May 2019
Posts: 315
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Post by nik on Mar 23, 2021 7:33:48 GMT -5
Any advice on exactly what kind and where to get one of those clamp on collars? I see a lot online but I'm a little worried they're going to rust, and the stainless ones seems super expensive... I've had good luck with the black oxide coated collars. All that I've done to prevent rust is give everything a good coating of antisieze during assembly. As far as using stainless on that machine, I would avoid it. Counter intuitive as it seems, the stainless will promote corrosion in the other metals in the system.
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Post by agatewhisperer on Mar 24, 2021 19:28:14 GMT -5
Thanks nik, I ordered some today. What do you use for antisieze? Would a little grease work as well? Can you tell I don't do this too often??
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nik
spending too much on rocks
Member since May 2019
Posts: 315
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Post by nik on Mar 24, 2021 22:50:07 GMT -5
Thanks nik, I ordered some today. What do you use for antisieze? Would a little grease work as well? Can you tell I don't do this too often?? You should be able to find antisieze at just about any auto parts store. I generally use the nickel based variety,although the copper will work too. Regular grease is better than nothing, but definitely not as good Just a word of caution, it is super messy to work with.
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Post by agatewhisperer on Mar 28, 2021 13:40:46 GMT -5
Alrighty, second question... I found a pulley I want to use on the arbor or at least have as a backup, but there's no set screw. How do you keep this guy on the shaft without spinning...?
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Post by parfive on Mar 28, 2021 14:03:25 GMT -5
That slot in the pulley is a keyway and requires a matching slot in the motor shaft for a rectangular key to be driven in, locking the two together.
So pulley is likely useless for your arbor. Not worth the effort drilling and tapping for a setscrew.
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Post by agatewhisperer on Mar 28, 2021 17:37:34 GMT -5
That slot in the pulley is a keyway and requires a matching slot in the motor shaft for a rectangular key to be driven in, locking the two together. So pulley is likely useless for your arbor. Not worth the effort drilling and tapping for a setscrew. Thanks for the info! My machine came with a box of miscellaneous parts is still working through this, appreciate the feedback.
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quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,332
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Post by quartz on Mar 28, 2021 22:20:34 GMT -5
At the $6+ cost of a pulley and a round trip to town, I can easily drill and tap for a setscrew.
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Post by parfive on Mar 29, 2021 2:06:04 GMT -5
At the $6+ cost of a pulley and a round trip to town, I can easily drill and tap for a setscrew. Sure, many of us could but I’m going to go out on a limb here and speculate that chances are better than good that when someone doesn’t know what a keyway is they don’t have a selection of taps and tap drills or a tap handle handy. I’d check and see what the wife’s got in that kitchen drawer of hers, though, before heading off to town. : )
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quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,332
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Post by quartz on Mar 31, 2021 1:45:46 GMT -5
Ummm, phone a friend?
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