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Member postings for Jmccrack

Here is a list of all the postings Jmccrack has made in our forums. Click on a thread name to jump to the thread.

Thread: Helping Dad Series
01/04/2015 00:02:21

Bruce

Looks great I am just starting mine

31/03/2015 18:07:15

Sorry........Got itsmiley

31/03/2015 18:06:04

Stew Thank you for the quick reply. I am working on the Mill engine now. What is 'PM"?

31/03/2015 15:48:06

I was wondering if anyone knows where I can get the drawings for the "Helping Dad" series in Model Engineer mag.I sent an email to the mag and to the hobby store they both said to check with you folks, Does any one have any ideas?

Thread: DRO on lathe cross slide accuracy/resolution
31/03/2015 01:57:02

I just fitted a 6' igage on my cross slide. I have a grizzly 14" x 40". I am please with the way it works, But as with any DRO you still have to know how to use a mic Here in Canada it cost me $40.00 well worth it if only to use as a reference with the dial on the machine.

Thread: Stewart Hart's Vertical Mill Engine
20/03/2015 14:43:39

Stewart. I am looking for the material list for this project. Has it been published yet?

Thread: Piston Ring size
17/03/2015 23:05:09

They are Teflon with a .050" crossection. This is a PM research model 3 steam engine with a brass cylinder and brass piston. Than you for the reply

17/03/2015 17:30:00

I have been do some research and I see on a .500" piston the ring should sit below the OD of the piston about .003". Does this sound right?

17/03/2015 01:05:10

I am building a PM 3 steam engine (first one). I have built the piston and cut the grooves. The piston is .501" the bore is .503". The rings are supplied. When I cut the groove and fit the piston ring what should i measure across the OD of the piston ring in the groove.

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