Shop Tricks From PM - Part I

BottleBob · 2009-05-22T21:50:33+00:00

To All: Here are some old shop tricks from a past thread in PM. Most of them are manual tricks so I've crossposted to rcm. I've condensed them here - so to see the original posts and authors you can go to the thread address given below:============================================================Reamer cutting undersize: For dull reamers that tend to cut very slightly undersize, i take a carbide insert and run it against the inside cutting edge of the flute. Kind of like using a "steel" on a good knife. slide it one way only, tip to end (the other way damages the tip cutting edge). This raises a slight cutting edge on each flute. do carefully, for doing too much, and you cut OS#2Three jaw chuck that runs out: Ever get stuck with a lathe that only has a 3 jaw chuck that won't run true but you have a part that needs .001" concentricity? I saw this in the Illinois Railway Museum where they had a large lathe and in the big 3 jaw chuck was a 4 jaw chuck in which the work piece could be indicated in as accurate as needed. Beats the trial and error shim routine.#3Another 3-jaw trick: After measuring TIR, shim the "high" jaw with a shim thickness of 1/3 TIR. (e.g. TOTAL measured runout = .006, use .002 shim in the high jaw.)#4Deep hole drilling in a lathe: Set your starting depth and lock the tailstock in place. Now move the saddle back until it bumps against the tailstock and lock it in place. Start drilling. When you're getting to the point where it takes longer to crank on the hand wheel than you care for, loosen the tailstock, pull it back to clear the chips, shove the tailstock forward until it bumps the saddle, lock the tailstock, and start drilling again. This is faster than doing all of that cranking but you won't lose track of how deep you have drilled.#5Skinny parallels: That strapping that you cut off of skids and throw away, save some. I use it for skinny parallels when I have to drill holes too close to the part edge that it would drill into normal width...

May 22, 2009 22 Replies

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cavelamb 17 years ago

Double thanks.

Exactly what I needed to remove a rounded out set screw.

Richard

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Doug White 17 years ago

BottleBob wrote in news:DrqdndoZD47XpofXnZ2dnUVZ snipped-for-privacy@earthlink.com:

What I've found works even better is copper plumbing tubing. It's a little softer & gets down in the teeth easier, and I always have a few scraps kicking around.

Doug White

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Stupendous Man 17 years ago

Elegantly simple. I have a set of Royal chuck stops,

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no idea why the boss bought them, but once i started using them they are pretty handy. The magnets are held in by glue that kerosene dissolves, I stippled them back in with a centerpunch.

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