RE: [CAD_CAM_EDM_DRO] Re: Keyways or set screws

We use Ringfeder in many application at work. As far as I'm concerned there is no comparison to anything else.
There avaliable in all different sizes. Bore your hub to fit, and tighten the bolts. It'll never move again!

http://mdmetric.com/prod/rfn/indexB.htm

http://www.ringfeder.com/indexB.htm



To: CAD_CAM_EDM_DRO@yahoogroups.comFrom: elson@...: Wed, 17 Dec 2008 20:50:34 -0600Subject: Re: [CAD_CAM_EDM_DRO] Re: Keyways or set screws



Frank wrote:>> A tight-fitting key is very good. >> >> Is that hard to achieve? Will I be able to get a tight fit with a > keyway broach? Does it take experience to use one properly? I don't > have a press, can a 9x20 lathe push a broach through aluminium?>> A wallowed-out keyway is fairly hard to repair. New motor shafts and broached keyways in new pulleys should be no problem.>> High-torque servo motors can loosen >> any setscrew, although installing two screws, one on top of the other >> has been a time-honored trick to keep them in place. Another scheme >> > is > >> to drill a dimple into the shaft where the screw seats. The best >> > scheme > >> is locking collars or collet hubs on the pulleys, although these can >> > be > >> quite expensive new.>> >> Yes, I've seen them. Gates make the perfect set of pulleys I was > looking for, unfortuantely the local Australian distributors don't > stock the particular series - they said they would need to import some > parts from the US and the others from the UK - free shipping would take > 3-4 months, or I could pay $200 for air freight :(> One other trick is to slit the hub and make a clamp ring to compress the hub. These can grip very tightly.You can even make your own collet hubs if you want to spend the time. A lathe taper attachment would be real handy to have, so the taper would be identical for inside and outside tapers.Jon






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