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Machine Shop and Tool Talk Shop Equipment, fabrication, repairs, how to fix it, which tool to use for the job. Machinist shop talk, straight to the point.

Machine Shop and Tool Talk

Hones


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Old 12-24-2015, 05:55:41 PM
DLM DLM is offline
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Default Hones

Any plans out there for making small hones for polishing up model crank shafts
need to take off about .003 to finish to size.

Thanks Don
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Old 12-24-2015, 09:20:09 PM
dkamp dkamp is offline
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Default Re: Hones

I can't add anything re 'plans' for making a hone, but my grandfather's brother would use a piece of glass, apply grease and garnet to do such things... he was also known to take a piece of well-polished hardwood, and do the same, but that probably wasn't as 'accurate' as glass. A cloth with some valve-lapping compound in it? Perhaps someone else has a better suggestion...
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Old 12-25-2015, 01:10:50 AM
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John Tice John Tice is offline
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Default Re: Hones

Are we honing ID cylinders or OD shafts or crank throws?
JT
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Old 12-25-2015, 02:08:12 AM
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Default Re: Hones

I am polishing up crankshaft rods and mains

Don
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Old 12-25-2015, 11:29:28 AM
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Default Re: Hones

Sunnen manufactures ID mandrels for about as small as you can imagine. For OD & crankshaft polishing you’ll probably have to use the fine sand paper method.
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Old 12-25-2015, 01:02:02 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Hones

What you are looking for we call a "lap". When I first got in the hobby there was an old guy that would make a V block out of aluminum, put a handle on it and a strap to tighten it, did a nice job. You tube lapping a shaft.
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Old 12-25-2015, 01:07:46 PM
Black Eagle Black Eagle is offline
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Default Re: Hones

You could use a small honing stone like the ones used to touch up the cutting edges of end mills. Check out victor tools ( no affiliation) in NYC they have a great mail order business. I've gotten some absolutely tiny hones for touching up the cutting edges on high speed steel slitting saws.
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Old 12-25-2015, 01:13:14 PM
John Dunn John Dunn is offline
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Default Re: Hones

Sunnen did / does make external honing mandrels for use in the floor model machines, possibly something that could be adapted to hand held drivers too, but they would all be driven from the end and would not work on a crank pin.
You could make something up from a couple long flat bars sized to the width of your journals, epoxy some properly sized stones in position, and a spring or rubber bands out at the end to apply pressure. 2 pieces of stone on one bar and another directly opposite so the journal self locates itself between the 3. Sort of an "in-the-block" crank grinder / hone. Turn crank slowly in lathe or whatever you have and let the end of your fixture float / reciprocate against lathe bed or bench. Like any precision honing operation you would have to go slow, gauge progress, and adjust fixture or technique to avoid taper and hit size. If you use just spring tension it would not correct for "out of round" which may not be a problem if you are perfectly round to start with. If needed, one could make the thing into a "rigid" hone by using a screw to apply pressure. Then it would only cut on the high spots until it was perfectly round.
Very possible you could get there with strips emery paper too if you do it with crank turning and do lots of measuring along the way.
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