The Home Machinist!

Harold, I agree, it would be tougher than I made it sound. I just thought that + or - .0005 was such a large tolerance for a ring guage that it would be possible to manufacture one on a lathe. But, I agree when you add the surface finish, the TIR, and taper, it would be difficult to calibrate, maybe...

ok, now remember, I said I was a retired mechanic, not a machinist [img]/ubb/images/graemlins/smirk.gif"%20alt="[/img] The actual size of the ring just has to be close to 5.000. To obtain + or - .005, you would just have to be able to hold .0005 TIR when boring the guage. I would think if ...

Les, Making the ring guage should be fairly easy. The actual diameter is not what's important....it's knowing the diameter that's important. The tricky part would be to accurately measure it. Any error in measuring the ring guage would be transfered to the bore guage when you zeroed the dial. I'm a ...

On the dial bore gauges I've used, we would adjust the extension to the range we wanted to measure and then zero the dial with a ring guage. I have seen people zero them with a micrometer but I believe the most accurate zero is with a ring guage ground to a known diameter. I'm not sure why you are g...

i ran a couple of turnmasters when i was working. the 13 x 40 seemed like it would be a great machine for the home shop.

jim

is this what you're looking for?

http://www.locknstitch.com/

i think it's worth mentioning the safety concerns when polishing on any kind of rotating machinery. for the proffesionals and the experienced hobbiests it's probably common sense and practice. but for the newbies who may be reading this thread, it's important to know that you don't want to use anyth...

alright jacin, i have to admit that you bring up an intersting point. it never occured to me that an argument could be made that + .0015 would be acceptable when + .001 was stated. and yes, it would never have been made in my world. but since you have run into this problem, it's good to be aware tha...

ok jacin, it may be tough sale from me to you. and it might be a tough sale under contract law. but i don't think a supervisor would have any trouble selling it to an employee. [img]/ubb/images/graemlins/grin.gif"%20alt="[/img] as to the original question... i remember the first time i had...

one thing to keep in mind is that some machines that are marketed as made in taiwan are actually manufactured in mainland china and shipped through taiwan. i think the main thing to look for is the specs on the machine. such as class 7 spindle bearings on a mill.

jim

jacin, i don't know about drafting school but in the working world, if you are given a dimension of .125 plus or minus .005, it would have to measure .1200 to .1300. or however many decimal places you were reasonably expected to measure. anything outside that could or would be rejected. regards, jim...

Whenever I had to use a dial bore gage, I set it with a ring gage and not a micrometer. You may not be getting the same pressure on your outside micrometer when used to measure the bore gage as you would get when measuring the telescoping gage. Also are your telescoping gages new? I've seen old ones...