T.I.R on lathes. What's acceptable ?

Newton

Newton

AzB Silver Member
Silver Member
Poll: T.I.R on lathes. How accurate are you?

I have started a check up on some lathes locally and I have asked all the resellers for a copy of the T.I.R measurements of the headstock/chuck.

How accurate are you guy's ?

Who has the best lathe T.I.R ? A little competition here :grin:

I'll start:

Machine (Not my personal one): Bernardo Proficenter 700WV
Runout of spindle nose;
a=Radial plane=0.01mm, Factory permissible=0.01mm
b=Face plane=0.01mm

Runout of center=0.015mm, Factory permissible=0.03mm

Kent
 
Last edited:
.01mm = .0003937 I would say anything within .0005 or less is acceptable, if you use an adjust tru buck chuck then you can get it deadnuts
 
My lathe is currently set at .012 mm in the face palne and about .006mm
radially.
When I trim pistons, I readjust it to .003 mm on the face and about .001 mm radially. I don't run it at that close all the time , as it heats up when running more than 1100 rpm.
These values are read off the finger dial test indicator. Yes my indicator reads to .001 mm increments.
Neil
 
My lathe is currently set at .012 mm in the face palne and about .006mm
radially.
When I trim pistons, I readjust it to .003 mm on the face and about .001 mm radially. I don't run it at that close all the time , as it heats up when running more than 1100 rpm.
These values are read off the finger dial test indicator. Yes my indicator reads to .001 mm increments.
Neil
 
Wow, Neil.

I'm not sure how good "good" is, but for me this sounds very low...
The numbers I mentioned is read directly from the factory cal-sheet, so I have no idea how bad it is now after a certain use...

Which lathe do you have ?

Kent
 
I have a carefully assembled Myford Super 7.
A friend has a similar lathe ,but is not as accurate as mine. I have offered to help correct it, but he is happy for what he makes.
 
I saw one of those for sale locally. Is'nt that the one with all the different belts driving the head stock? Can't find the ad now :)
If I remember correct, there is no hole through the spindle (or at least it looked like a "cup" covering the back of it)?

K
 
Yea, they only have 5/8 through the spindle. They are a model engineers lathe. With a milling attachment, I have seen people make complete model steam engines, just using the Myford. They are English made, have have a huge following amungst model engineers. Mine has the quickchange gearbox that allows a multitude of thread pitches and feed rates. I also have the fine pitch cross-slide screw. Each division is .01 mm on diameter.
So with a metric micrometer it works very well.
But there are alot of really good machines available and at a good price these days. Hard to beat real machines like Hardinge, emco-austria etc
Neil Lickfold
 
Neil,

Cool lathe, that Myford. I remember it looked a little small in the ad, and it was mentioned that it was still in production (in the ad)...

I have been looking at a lot of lathes and as posted under the Grizzly/Emco thread, they all looks the same to me.

Non of the resellers of lathes over here has come back with any T.I.R charts, so I guess I ask to much...

I was hoping more would share their tolerances so I could see which "ball park" to go for, but I'll guess I see some differences if I get the T.I.R charts from the resellers.

The Emco's, are these really made in Austria still?
I got the impression that they all are made down in China now...:scratchhead:

Kent
 
Emco lathes are made in Austria,

Enco and grizzly are made in china
Only one letter different, but the m to a n is a big difference in quality.
Neil
 
i think Grizzly sells a gun lathe that comes with all tolerances on a chart.

i think the lathe is actually basically the same as the regular 12x36 but they take the time to calibrate it and write the specs down.
 
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