Great work Mark!

Well you know the moco will just steal the idea anyway. Seems they did it with the compensator a few years back.

 

Great job! Crossing our fingers that it does the job.

 

Hey Max, the run out appears to be.007-.008”. I don’t know if that’s too much. What do you think? I can get them to machine another nut, I just don’t know if it will be any better. With Harley there could be that much runout in the mainshaft. Look what they say is OK on a crankshaft.

 

Using a grade 8 nut makes it plenty hard for the sealing surface. The clearance in the I.D threads and O.D threads accounts for the runout he’s seeing of .006 or so. Unless we thread it onto a locating surface to center the nut, single pointing the threads or tapping them wouldn’t bring the concentricity down much if at all, (if we consider it’s a 2b class of fit)

And I always enjoy the arm chair machinists quoting our cycle times for us. A pallet is what we bolt our tombstones to, or fixture plates if using a vertical mill. What tools are we using? Solid carbide or indexable ? How many flutes? SFM and IPT?? Solid carbide drills ? Is that drill in a shrink fit or an collet?

If you can set up a fixture, indicate it in..load all your tools, do your offsets, write the program, single block thru the program, and do all that without scrapping any?? Sorry, what we do isnt as easy as you think

 

That’s fine $Stonecold, .007 to .008 is to be expected. If you move forward with production, we can tighten up the runout. It’ll only affect seal life, and at this point it’ll be negligible in your testing.

 

It's hard to say.. After all the seal does float some.. HD claims run-out can be something like 0.011 on the crank but it's measured at the end and not close to the bearing. The crank seal on HDs is right next to the bearing.. Still the spacer is a slip fit and it has some play so there can be more run-out.

I'm not sure how close you can get the surface to run true as the nut's centering is based on how the thread are cut on the shaft. They should be true too the shaft but it really depends on how they were cut.

I'd figured that if you were under 0.005 you'd be good but that was really an armchair figure. I'd give it a shot..

If it don't work, send me a nut and I'll cut it on single point threaded shaft.

 

the seal design allows for quite a bit of runout. There’s also a consideration of surface Ra per seal design

 

If you will, get a 3/4”-16 grade 8 nut and cut it down for me. The seal is 1.0625 ID. Leave .25” width hex on it. Overall width is .580”. Chamfer the edge slightly to facilitate insertion in the seal. Let me know what I owe you for materials, time, and shipping. I would like to get it a little better than it is. I reset the dial indicator to a better mount and it was reading .009”.

 

 

I'll give it a shot. If the new nut is better, I'll figure something out. If not you owe me nothing.