Re: headstock stock run out?

William R Meyers <wmrmeyers@...>

You have better equipment than I own. My tenths mike is a Harbor Freight. I've tested it against the good set of gage blocks at school and it's accurate to its specified limits, but who knows how long it will last. OTH when I got it, it was better than I am. :) I'm doing better and hope one day soon to be able to justify upgrading. When I got it, a year and a half or so ago, I was afraid I'd ruin a better quality tool. I have since learned better technique, and developed a better feel for the "right" amount of pressure to get a good measurement. Maybe I won't be so ham-handed when I finally get good measuring tools.

Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)

Guard your women and children well,
Send These Bastards Back to Hell
We'll teach them the ways of war,
They Won't Come Here Any More
Use your shield and use your head,
Fight till Every One is Dead
Raise the flag up to the sky,
How Many of Them Can We Make Die!

Heather Alexander, March of Cambredth


On Mon, 3/6/17, johnnyblock1@... [SOUTHBENDLATHE] <SOUTHBENDLATHE@...> wrote:

Subject: Re: [SOUTHBENDLATHE] headstock stock run out?
Date: Monday, March 6, 2017, 2:21 AM

I am using a Starrett
micrometer with .0001 graduations. I repeated the
measurements enough times to be confident of the values.
Also, after testing a 3 inch piece, the difference was
pretty much 3 times the results of the 1 inch piece. I
certainly am no expert, but this is pretty clear.

Normally I wouldn't worry
about a .0005 tolerance. However, the plans for theĀ  small
IC engine I am building call for the piston to be no more
than .0012 smaller than the cylinder. With an inch and a
half long cylinder, a .0007 difference in diameters to start
with seems to be too much.

Please feel free to correct
me if I am missing some thing here. I am teaching myself and
can use all the help I can get. Thanks, John.

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