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

press fit sizes

All Topics | Latest Posts

Search for:  in Thread Title in  
martin perman12/11/2018 18:33:18
avatar
2095 forum posts
75 photos

Gentlemen,

I am going to make four 2.5" rollers for a friend with .5" axles using silver steel what drill size could I use to get a light press fit or would I need to ream the hole .5"

Martin P

vintage engineer12/11/2018 18:37:16
avatar
293 forum posts
1 photos

As a rough guide you need the hole .001" per inch undersize. So you need to make the holes .0005" under the size of the silver steel. So measure the silver steel first then set your reamer to cut as above. I would make a test hole first.

Speedy Builder512/11/2018 18:52:33
2878 forum posts
248 photos

You would be very lucky to get an accurate fit by drilling. You would have to ream or accurately bore the holes. Again, you would have to measure the actual diameter of the shaft and from that select the correct reamer 'Fit'. However, most of us probably have the generic H8 reamer and instead of passing the reamer through the hole, just use the bottom end of the reamer (The tapered section) and by trial and error open up the hole to get the push fit you require. Note, not all lengths of silver steel are the same diameter - it is ground within limits.

Imperial 1/4 to 1in ±0.00025 in
John Rudd12/11/2018 20:13:49
1479 forum posts
1 photos

You could make the holes undersize, then heat the parent metal to allow a sliding fit for alignment

Mick B112/11/2018 21:14:24
2444 forum posts
139 photos

Can you duck the issue with a tapped side hole and a grubscrew?

martin perman12/11/2018 21:51:37
avatar
2095 forum posts
75 photos

Its an antique butter churn which my friend drives with a stationary engine, we are replacing the rollers which the drum sits on so I would like it as original as possible so grubscrew wouldn't match the look I have adjustable reamers so I can ream to size, I wasn't sure of the tolerances.

Thank you,

Martin P

Hopper12/11/2018 21:58:16
avatar
7881 forum posts
397 photos

Could you turn the roller and axle protrusions out of one piece of 2.5" round material? Would save a lot of work.

martin perman13/11/2018 07:49:22
avatar
2095 forum posts
75 photos
Posted by Hopper on 12/11/2018 21:58:16:

Could you turn the roller and axle protrusions out of one piece of 2.5" round material? Would save a lot of work.

Forgot to mention that the roller is made of brass. You have all pointed me to the right way, thank you.

Martin P

Chris Evans 613/11/2018 09:24:15
avatar
2156 forum posts

Loctite 638 is your friend.

Ian S C13/11/2018 09:58:00
avatar
7468 forum posts
230 photos

I agree with Chris Evans, Loctite is by far the easiest way to go. You better make sure that the brass is lead free in a food environment.

Ian S C

Michael Gilligan13/11/2018 10:09:30
avatar
23121 forum posts
1360 photos
Posted by martin perman on 12/11/2018 21:51:37:

Its an antique butter churn [ ... ] I would like it as original as possible

.

Chris/Ian

I am [as you might expect] with you on the matter of Loctite 638

... But I assumed that Martin must have discounted it, on principle.

MichaelG.

Edited By Michael Gilligan on 13/11/2018 10:10:00

martin perman13/11/2018 10:10:04
avatar
2095 forum posts
75 photos
Posted by Ian S C on 13/11/2018 09:58:00:

I agree with Chris Evans, Loctite is by far the easiest way to go. You better make sure that the brass is lead free in a food environment.

Ian S C

Thank you all again, Ian, I liked your comment about being lead free, the Butter churn will not see milk in it again as its purely for display only smiley

martin perman13/11/2018 10:29:03
avatar
2095 forum posts
75 photos
Posted by Michael Gilligan on 13/11/2018 10:09:30:
Posted by martin perman on 12/11/2018 21:51:37:

Its an antique butter churn [ ... ] I would like it as original as possible

.

Chris/Ian

I am [as you might expect] with you on the matter of Loctite 638

... But I assumed that Martin must have discounted it, on principle.

MichaelG.

Edited By Michael Gilligan on 13/11/2018 10:10:00

MichaelG,

Its a simple task and 638 is a simple solution, there are no serious loads involved and means making the job easier smiley

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
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