Hi John,
I would guess that Wam has taken the very sensible attitude that if you are making tests using a master test bar you would avoid adding unnecessary errors.
If you put the test bar in a reducing sleeve you are adding the errors that must exist in the sleeve to the test measurements that you take.
All the best,
Ian
From: "John Lindo bechetboat@yahoo.com [7x12minilathe]" <7x12minilathe@yahoogroups.com>
To: "7x12minilathe@yahoogroups.com" <7x12minilathe@yahoogroups.com>
Sent: Sunday, 20 December 2015, 3:36
Subject: Re: [7x12minilathe] MT3 Test Bar from Ebay.
Hi Wam, glad you like test bar.
Just a question on why you chose the #3 MT bar as opposed to a # 2 MT with a #3-#2 reducer.
A # 2 MT would allow you confirm any T/S misalignment issues as well as checking the H/S.
Hoping you are keeping well,have a festive season and happy new year.
John
Spain
On Saturday, December 19, 2015 10:08 PM, "WAM ajawam2@comcast.net [7x12minilathe]" <7x12minilathe@yahoogroups.com> wrote:
Just got my 3MT testbar from the aussies on Ebay. The one that comes in
the wooden box. It came in a UPS bag, with a Toll (AU's carrier) bag
inside. Needless to say the wooden box suffered a bit of damage, tho
just the ends. The wooden box was bubble wrapped fairly tightly so I
don't think the bar was damaged; at least no obvious indication of trama...
A few years back, I did a Rollie's Dad's Method with an old injet
carriage bar i had lying around. The new test bar agreed that I was
off about 1mil of headstock alignment. I'd checked the ways previous to
this and I got lucky, everything was within a mil...
You may still want to use RDM with a testbar - I still see about mil
variance at the far end when it rotates; at the headstock I can't even
see my indicator move, so the 3MT taper is damn close to the bar section.
Got the headstock about as good as a 7x can get...
TSE Ming-wai mwtse@netvigator.com [7x12minilathe] wrote:
>Many thanks, have ordered from ebay.
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>Posted by: TSE Ming-wai <mwtse@netvigator.com>
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Posted by: Ian Newman <ian_new@yahoo.com>
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