What Did You Buy Today?

Ordered at a local foundry a grey cast iron block: 23 x 13 x 11 cm [L x l x h]

I plan to raise the mill column by 10cm.

Just sandwich it between the base and the column and use longer bolts to hold the column.

I might epoxy it to the column. Don't know if this helps with vibrations.

I will also check the column squareness to the table and if out of square I will add the necesary angles when facing the block.
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Just another write-off, the reason I won't pay much up front. If it works out, I will buy another one new. Although I did beat out a couple of other bidders. What I wanted to do is measure the "root?" diameter of a screw. But the anvils are too thick (~0.020") to measure the small (<1/4-20) threads I deal with. They will do fine, I guess, for a 5/8' bolt and things of that size. But even with the slight angular meeting of the anvils, they are thicker than the pitch of most of my work. Ces la Vie', $h!t happens. . . I'll just stick to a good caliper with sharp edges, and my understanding of screw threads to determine drill sizes.
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What do you figger your chances of grinding the tips so they fit for you? Might not get a tenth accuracy but I think one or two thou should be possible, yes? If I were going to ‘write it off’ anyway I think I’d grind them and see what happened.
 
While it is a write-off, I would be highly skeptical of grinding the tips. Because of my (lack of) accuracy. Added to the reluctance to "modify" a manufactured tool unless absolutely necessary. Then there is the real problem, in that the screw threads around a 2-56, that I consider to be the middle of the range I work in. I consider a 1/4-20 to be a large screw and occasionally deal with 3/0-120. I do make "off-normal" threads, some obsolete or archaic, some custom for a difficult application.

I do thank you for the suggestion, even though I thought the same when I ordered it. I am currently using the "knife edge" tips on a dial caliper. That has been moderately satisfactory since the '70s. I have had to "oversize" a few times, but only a few, in near 50 years.

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Nothing wrong with owning groove mics . They come in handy ! :encourage:
 
Bi11Hudson said:
Just another write-off, the reason I won't pay much up front. If it works out, I will buy another one new. Although I did beat out a couple of other bidders. What I wanted to do is measure the "root?" diameter of a screw. But the anvils are too thick (~0.020") to measure the small (<1/4-20) threads I deal with. They will do fine, I guess, for a 5/8' bolt and things of that size. But even with the slight angular meeting of the anvils, they are thicker than the pitch of most of my work. Ces la Vie', $h!t happens. . . I'll just stick to a good caliper with sharp edges, and my understanding of screw threads to determine drill sizes.
View attachment 428091
Click to expand...
This is a blade mike, handy for measuring the diameter of grooves and other hard to reach features. Screw thread micrometers either have a set of interchangeable anvils to handle a range of pitches, or handle only a narrow range. A pair of anvils consists of a vee-point and matching notch. Around $60 new on eBay:

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saw this and was wondering about using it

shop.idealprec.com

Fowler 52-090-008 Digi-Pitch Set of Holders *NEW - OVERSTOCK*

Item Description Digi-Pitch Sets offer an affordable alternative to conventional pitch micrometers Easy set up and calibration Provides quick, accurate thread measurements Can be used as a Go-NO/GO gage No need for cumbersome measuring wires or measuring triangles Can be used with electronic or...
shop.idealprec.com shop.idealprec.com
 
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