Information needed on some expanding lathe mandrels

Hello everyone

I purchased some boxes of tooling and lathe accessories recently. In the lot were some expanding mandrels. There are 2 different shank diameters on them. Both sizes have tapers on the shank and they aren't threaded on the inside for an expansion screw or anything. At first glance I figured they were made to fit a morse taper (Morse 4 on the larger one and Morse 3 on the smaller). They are very similar in size to a morse taper but they don't fit snug. A couple of the mandrels are still in the original plastic bag. Sizes written on the bag are "1x1 -210", "1×1-1/2 -210" on the smaller size and "2×1-1/2 -425" on the larger ones. One bag says "Mr. Toolman" I assume the manufacturer or vendor but no part numbers on any of them.

1) Do I need a special collet, adapter or chuck to use these? I tried a 5c collet adapter for the larger size but it was too large for the larger mandrels to fit it.

2) are the expanding screws and hardware for these commercially available? I tried searching the Web but other than a few of the same "mr. toolman" mandrels for sale on that large online auction website i couldn't find very much. Nothing on MSC either.

3) do the mandrels need to be drilled and tapped for expanding screws?

As always. Thank you
Martin

Look to me to be just like 5c Rovi expanding collets. Go to you tube and see how they work. They are great tools. I may have extra collet adapters for them.

+ on Rovi ID. I use them and like them. If you don't need them I would like to talk about buying them from you.

rke[pler said:

+ on Rovi ID. I use them and like them. If you don't need them I would like to talk about buying them from you.

Click to expand...

Send me your email and I’ll send you a pic of what I have. I’ll sell them for 1/2 what Rovi gets for them.
Jim

I’m selling stuff because I’m 85 years old and it’s time. Jimatcf@ Hotmail.com

Good info! Thank you. I'd be interested as well
Martin

Rovi extra parts for sale 1/2 what Rovi sells them for.
Jim
Plus flat rate box from post office.

Why would you use this system of a sleeve and collet insert over a one piece assembly?

Tom

Once you have the collet assembly you only have to replace the soft heads as you need them. They range in size from about 1/4 inch to 6 inch heads. I ran many thousands of parts with them in production runs. The Rovi company has a you tube video showing how they work.
Jim