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Unknown Lathe Cutters

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BROCKWOOD

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#1
I have 2 double ended lathe cutters that came in a lot I bought. The only markings are to identify each end & read: UNDER 1/2" DIA., 1/2" TO 1 1/4" DIA., 1 1/4 TO 3 DIA., 3" DIA & OVER.

The only difference I can find in comparing all 4 ends is in the rake of the angle leading to the tip. Sorry for the pics as I could not capture the marking with my camera.

IMG_20181113_233747757_HDR.jpg IMG_20181113_233807740.jpg
IMG_20181111_005412056.jpg
IMG_20181111_005443076_HDR.jpg
IMG_20181111_005449727_HDR.jpg
 

SamI

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#2
Face grooving tools maybe? Although possibly not seeing as they appear to be ground to a point.
 

BROCKWOOD

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#3
SamI pics are aweful. Not ground to a point. Square face of less than a 32nd is the same for all 4 ends.
 

Eddyde

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#4
That's the beauty of HSS tooling, you can grind em to any profile you need. There probably billions of custom ground tools out there.
 

benmychree

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#5
Looks more like gages than cutters.
 

BROCKWOOD

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#6
John, they are not sharp & look unused. You might be correct! So, how would they be used as gauges though?
 

benmychree

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#7
Good question, but the fact that they are stamped or engraved with that info tells me that they are not likely cutting tools, but some special gage for some special job. The fact that they exhibit grinding reliefs in the corners speaks loudly "GAGE".
 

otee453

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#8
They are the inserts for Brown & Sharpe No. 900 clearance gage. I have the Starrett gage, not a B&S model. The two are of significantly different designs, but both are used to measure the clearance angle on horizontal milling machine cutters. The starrett is more versatile, I believe, but I could be wrong having never used the B&S.
 

BROCKWOOD

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#9
otee453 nailed it! I had to Google it & found this page:

GAUGE B&S 900 00.jpg
 

BROCKWOOD

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#10
Prices for these are crazy in that they range from $20 to $80 - but none seem to have both of the inserts. 1 on ebay has the ends ground off the single insert that is included. Should've bought that. I found a cheaper 1 & bought it before really looking at what all is out there. I actually do want to sharpen my horizontal mill cutters. So, this gauge can be of use! I thank you all for your help.
 

benmychree

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#11
I have egg on my face on this one, I have one, but did not connect the pic with what I have, and yes, the Starrett tool that is similar is the better tool, as it will measure the angle rather than just confirming that it is the same as one gage or the other (or not). Yes, I have one of them also. One does not really need one, if one just adjusts the grinding wheel height or the tooth rest to match the angle that is presently on the cutter to be ground, just take a light cut on one tooth and observe if it cleans up the whole slope of the tooth relief, if it does not, adjust the height accordingly.
 

BROCKWOOD

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#12
Wish I knew how to edit the title of this thread now that you all have solved the mystery. A few pics of the 1 I picked up off of ebay to make it a complete tool! I'd love to see pics of the Starrett version here. B&S 900 GAUGE 20181210 01.jpg B&S 900 GAUGE 20181210 02.jpg B&S 900 GAUGE 20181210 03.jpg
 
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