By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Forum House Ad Zone

t.i.r.?

All Topics | Latest Posts

Search for:  in Thread Title in  
GoCreate23/03/2011 17:15:04
avatar
387 forum posts
119 photos
In his article MEW 175 'using collets in my lathe' Mike Houghton refers to collet runout measurmrnt as t.i.r. i.e. o.oo5" (t.i.r.)
 
What does t.i.r. stand for?
I am sure once someone tells me I will hang my head low in shame of not knowing.
 
Cheers
Nigel
Andrew Johnston23/03/2011 17:21:02
avatar
7061 forum posts
719 photos
Total Indicated Runout, ie, what you actually measure. It doesn't, on its own, tell you whether the runout is axial or radial, or a combination of both.
 
Regards,
 
Andrew
Dusty23/03/2011 17:28:52
498 forum posts
9 photos
Hi
It stands for 'total indicator reading' The indicator being a clock,dial gauge or whatever you know it as. Total reading is twice the runout i.e if the reading is .002" then your runout is .001". We all come across these things from time to time when we do not know what the term really means. I was allways told if you don't know ask, it is no good guessing.
GoCreate23/03/2011 17:30:48
avatar
387 forum posts
119 photos
Oh, so obvious.
Thanks for a very quick answer
 
Nigel
John Olsen23/03/2011 18:09:20
1294 forum posts
108 photos
1 articles
Ok, let's expand on things a little. The reason that it is "total" is that it is the runout due to eccentricity added to the runout due to the job not neccessarily being round. (For instance a piece of centreless ground bar may have a lobed shape rather than being a true circle.) The indicator will measure a amount that depends on all the errors. Practically, when the total indicator runout is minimised, the job is as close as you are going to get to being truly centred. The reading will only be twice the eccentricity in the case where the job is for practical purposes truly circular, which is often, but not always the case.
 
Andrew, whether or not you are measuring radial or axial runout is going to depend on how you have set up the indicator. Taking say a flywheel shape, if you set up the indicator to read against the outside cylindrical surface you will measure radial runout, while if you set it up against one side you will measure axial runout.
 
regards
John
 
 
Stovepipe24/03/2011 11:05:22
196 forum posts
Posted by tractionengine42 on 23/03/2011 17:15:04:
What does t.i.r. stand for?
I am sure once someone tells me I will hang my head low in shame of not knowing.
 
Cheers
Nigel
 
Rubbish (grin!). We all have to learn. The asking of the question proves that you want to learn, so there is NOTHING to be ashamed of.
 
Dennis

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Sign up to our Newsletter

Sign up to our newsletter and get a free digital issue.

You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy

Latest Forum Posts
Support Our Partners
cowells
Sarik
MERIDIENNE EXHIBITIONS LTD
Shopping Partners
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest

 

Donate

donate