Thread: New Tapered / threaded mandrel for sanding and buffing razors

Originally Posted by skipnord

Cool, Randy. I'm rebuilding an old pulley driven grinder to use as a buffer. 1/4 hp/1750rpm, and about 3 inches of clearance. Not as long as yours, but it should work a lot better than my 2 speed grinder. Pics on request.

Hey Skip, post some pics of your setup in this thread please. The whole idea is to give people some ideas on how they can get setup.
If you have 3" of shaft on each side that would be workable but very tight.

Originally Posted by randydance062449

. The clearance on each end is about 8.5 ". Since I will be running it at about 1000 rpm max I expect no wobble. Tomorrow I will be installing the arbor on a table & connecting it to a motor. More pics to follow.

Why are you running it so far out? I would expect wobble to be an issue. I have good luck with my set up with. an adapter at each end of a motor. One has to be left and the other right hand threads. easy I will show pics if wanted. Not tonight!

Tim

Originally Posted by 32t

Why are you running it so far out? I would expect wobble to be an issue. I have good luck with my set up with. an adapter at each end of a motor. One has to be left and the other right hand threads. easy I will show pics if wanted. Not tonight!

Tim

Hey Tim
My primary use is for sanding razors, not buffing. That requires a speed much slower than 1750. More like 400-800 rpm . I do not expect any problem with wobble at the slower speeds and using small wheels of 1.5" to 3" max.
The reason for ~ 8" is for clearance of the entire blade. Check out Charlies video to see the advantage of clearance. You won't be pushing the tail of the razor into the motor/ bearings/chuck depending on the specific setup.

Originally Posted by randydance062449

Hey Tim

The reason for ~ 8" is for clearance of the entire blade.

I see your points but 8" is a little extreme. Are you leaving the scales on?

Tim

Randy asked me to post some pictures of my low tech buffer. I bought the pulley driven grinder at a garage sale for $2, the motor was free, and I used about $15 worth of miscellanious to complete the unit. Since buffing wheel are thinner than grinding wheels, I was able to gain some extra space by adding 1/2 copper pipe spacers. This gives me enough room to buff virtually any size knife or razor. Posted FYI.

Yup! I have an arbor/shaft almost identical to that. It has an old 1750 RPM 1/4 HP motor that runs like a champ. The downside is that I cannot reduce the speed to 400-800 range nor can I use a 1.75" diameter sanding wheel that will fit into the hollow of a 9/16 blade. If I do mount that size of wheel on that arbor I will most likely be knocking the tang into the arbor ( assuming I get the speed down some way). For me this is all about sanding/grinding to remove pitting. It is not about buffing.
Thanks for posting your pics! They will help some new guys for sure.

Hey Tim
Yes, in some cases I will be leaving the scales on but even with them taken off the length of the blade is ~6". Then add on my fat fingers and a little bit for slop and 8" is used up kinda fast. Especially if your using the wheel on the right side and trying to sand/buff the face of the blade. I could get around this if I used the same grit wheel on the left side of the shaft but then I have to duplicate wheels.

Originally Posted by 32t

I see your points but 8" is a little extreme. Are you leaving the scales on?

Tim

Originally Posted by 32t

I see your points but 8" is a little extreme. Are you leaving the scales on?

Tim

While Randy gave you a pretty good answer already, remember that some razors are custom and go beyond the usual 6", so I might even be tended to go with 9"

Originally Posted by FiReSTaRT

While Randy gave you a pretty good answer already, remember that some razors are custom and go beyond the usual 6", so I might even be tended to go with 9"

Yes, the other option I have with this setup is to push the shaft more to the right if needed. Just like Spazola ( Charlie Lewis) has done with his. Check out his Youtube video to see it and notice how the right side is longer than the left side.

.

Originally Posted by randydance062449

Hey Tim
Yes, in some cases I will be leaving the scales on but even with them taken off the length of the blade is ~6". Then add on my fat fingers and a little bit for slop and 8" is used up kinda fast. Especially if your using the wheel on the right side and trying to sand/buff the face of the blade. I could get around this if I used the same grit wheel on the left side of the shaft but then I have to duplicate wheels.

Hey Randy etc.

My second post referring to leaving the scales on was meant as more of a joke. Sorry if it didn't come out that way.

Tim