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Good point. I can only get a 5.98 degree helix angle on my lathe. Not even close.

A crude way to cut a helical cam would be to set your compound feed to 90. Find the pitch you want and keep the half nut engaged. Do one side at a time by manually rotating the chuck back and forth moving your cross feed each time on the cut stroke and then rotating the chuck backwards past your...

Thought I would update the thread in case anyone was interested... I CNC'd some bump rings from 4130 with .015" wall thickness and gave them a single split. I cut recesses on the bolt .020" deep. The rings slipped over the bolt without any problems. After trial fitting I used JB to secure them...

There used to be one of these barrel benders at the Colorado School of Trades, but we were never taught to use it. If someone could locate one it would make for a really interesting experiment to chart the effect on accuracy as more bend is added. It makes some sense to me that a perfectly...

I understood most of what you were telling me except this^. Ah. I'm assuming this is to prevent oxidation inside the bolt? I'll show my age a bit here... When I was in gunsmithing school I was taught to put motor oil inside barrels when soldering quarter ribs, barrel bands etc. The oil smoke...

I think I have seen this method. Looks like he cut a dovetail and used a sight blank? It looked pretty cool, kind of like a woodworker's dutchman. Thank you Dan. Do you fusion weld the front of the sleeves under the lugs as well? Are you talking about gassing a purge chamber or upping the...

It doesn't get any more pro than that! I thank you very much for sharing that. So it looks like a bushing with a raised boss under under the lugs and matches the bolt diameter everywhere else? This action is slightly larger up front than it is in the rear so I think this is the concept I want...

I've sleeved bolts before but never tried bumps so any advice I can get will be greatly appreciated. The rear bumps don't worry me, but right up under the lug for that lower one on a 700 has me a bit concerned about heat management. My plan is to mill a close fitting aluminum heat sink and to...

At .277" you may (probably) not have to neck turn at all. I would use the smallest dimension for calculating clearance. whoops- just re-read your post and see the .279" is after sizing. disregard the no turn required. :o

The image titled 79c is a brand new 320 belt, and 80c is a brand new 600. A 6" long section took a couple of seconds with the 320 and maybe 15 seconds with the 600. Another plus is that it doesn't wash out lettering like a buffing wheel.

I'll try to post a picture or two when I get to the office tomorrow. It looks a bit different than lathe polishing just because of the angle of the cut. It doesn't look worse to me, just different. I think I just tossed the last 400 belt but I know I have 320 and 600 I can show you.

Unfortunately I didn't have any luck when I tried to use them. They use 3x25- 7/32" belts. My drum is over 20 years old also so it's a pretty durable $100 item. You can get crazy grits like 3000- http://www.amazon.com/3000-Diamond-Sanding-Expanding-Rubber/dp/B003V10JWO

Piping in from long time lurking... If you are using a barrel spinner, do yourself a favor and try a Murray Sanding drum! Grit Changes in seconds and grits from 30 to several thousands. (Jewelry supply houses sell the super fine grits) You can get a barrel from Mill finish to mirror faster...

How about turning a mandrel with a boss that fits snuggly in the Die bushing bore that extends far enough into the die body to indicate ?