Re: [7x12minilathe] MT3 Test Bar from Ebay.

I do 99% chucking work, mainly dayjob stuff. Lots of boring. I use the
tailstock for drilling but that's about it. The work I use it for is no
where near as critical as what you guys do, the modeling stuff I see
posted by the users like you guys blows my mind.... even with a nuts
dead on lathe I doubt I could even come close.

I did try and test the tailstock alignment with it - I typically use a
coax to align the TS.

They center both ends of the test bar... with the indicator still at the
far end of the testbar, I checked to see how far the indicator moved
when I cranked a center into the predrilled center hole of the
testbar. With the center fully seated into the predrilled testbar
center hole it barely registered any deflection. So i guess the coax
method I use is OK for what I need.

Happy holidays to all on the list. I can't think of a better resource
for any machine tool than the forum here. Learned a lot.

Ian Newman ian_new@yahoo.com [7x12minilathe] wrote:

>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.
>JohnSpain
>
>
> 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.
>>
>>
>>------------------------------------
>>Posted by: TSE Ming-wai <mwtse@netvigator.com>
>>------------------------------------
>>
>>
>>------------------------------------
>>
>>Yahoo Groups Links
>>
>>
>>
>>
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>>
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>>
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