Whatsit question (tooling)

rgray

rgray

Active User
H-M Supporter Gold Member
Came across this set a few months ago. Not sure what they are. First thought was tailstock centers, but the 3/8 stem made me think they weren't built heavy enough
for that.
They have a .593 shoulder with a spring clip.
One is just a straight shaft after the shoulder and that shaft measures .417
The small shaft made me think they came apart from their shafts, but as far as I can tell they are one piece. Must be made from castings?
There is a center on the inside. Assuming for machining them between centers.

20181210_105725.jpg
 
very interesting find,
they might be part of a system
it seems they could be used on pipe or other cylinders
 
WAG here . Possibly tapered mandrals ? Perhaps someone had products with internal tapers and needed the OD turned or ground concentric . We had some similar for our cylindrical grinders , but it's just a guess .
 
Ulma Doctor said:
very interesting find,
they might be part of a system
it seems they could be used on pipe or other cylinders
Click to expand...

Yes that's along my line of thinking.
They show very few marks. Maybe didn't get used much. Originally I figured they weren't for metal work because of the few/light markings.
Running a file on the end they are very hard though. (maybe they are metal working?)
 
mmcmdl said:
WAG here . Possibly tapered mandrals ? Perhaps someone had products with internal tapers and needed the OD turned or ground concentric . We had some similar for our cylindrical grinders , but it's just a guess .
Click to expand...

That might make more sense than my thinking lathe center. Grinding would be less stressful for them maybe?
Interchangeable live centers for grinder?
Slipping the 3/8 shaft into something with bearings doesn't seem like a grinder thing though. Wouldn't there be to many places
to introduce slop. Though if turning on a mandrel it would probably not be a high precision part being worked on in the first place.
 
There is a number 30547 on one of them. Do they each have a different number?
Are the tapers all the same?
The rim is knurled, must be for turning by hand. Could be a quality control tool for checking runout with a dti.
How true do they spin?
 
Perhaps taper gauges for blueing in ? LOL , you got me stumped here . :grin:
 
Tozguy said:
There is a number 30547 on one of them. Do they each have a different number?
Are the tapers all the same?
The rim is knurled, must be for turning by hand. Could be a quality control tool for checking runout with a dti.
How true do they spin?
Click to expand...


One other one (1.5inch large end .800 small end) has a number. It's 6027 no others are numbered.
I put three in my lathe for a quick n dirty measurement.
3/8 5c collet with a .376 gauge pin (no sure where the .375 is, it's around here somewhere) has right around .001 run out. Measured with a .1 per rev indicator.
One inch travel gave .185 .190 & .200 taper per inch on them. so yes tapers the same.
They all had about .003 runout on the end and .001 up at their largest size.
If I had a long dead center and could indicate them that way they might be much closer. I was a bit surprised they were as good as they are.

Originally I was looking around for a weaving loom or some such thinking they were bobbin spinners or something to do with leather working.
 
There seems to be some contact marks (burnishing?) on three of them.
Really curious why they have spring clips.
Are they all hollow with a centre divot inside?
 
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