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press fit sizes

This topic has 13 replies, 9 voices, and was last updated 13 November 2018 at 10:29 by martin perman 1.

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12 November 2018 at 18:33 #380340
martin perman 1
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@martinperman1
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
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12 November 2018 at 18:33 #26292
martin perman 1
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@martinperman1
12 November 2018 at 18:37 #380341
vintage engineer
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@vintageengineer
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.
12 November 2018 at 18:52 #380343
Speedy Builder5
Participant
@speedybuilder5
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
12 November 2018 at 20:13 #380351
John Rudd
Participant
@johnrudd16576
You could make the holes undersize, then heat the parent metal to allow a sliding fit for alignment
12 November 2018 at 21:14 #380355
Mick B1
Participant
@mickb1
Can you duck the issue with a tapped side hole and a grubscrew?
12 November 2018 at 21:51 #380360
martin perman 1
Participant
@martinperman1
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
12 November 2018 at 21:58 #380361
Hopper
Participant
@hopper
Could you turn the roller and axle protrusions out of one piece of 2.5" round material? Would save a lot of work.
13 November 2018 at 07:49 #380381
martin perman 1
Participant
@martinperman1
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
13 November 2018 at 09:24 #380390
Chris Evans 6
Participant
@chrisevans6
Loctite 638 is your friend.
13 November 2018 at 09:58 #380392
Ian S C
Participant
@iansc
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
13 November 2018 at 10:09 #380395
Michael Gilligan
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@michaelgilligan61133
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
13 November 2018 at 10:10 #380396
martin perman 1
Participant
@martinperman1
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
13 November 2018 at 10:29 #380399
martin perman 1
Participant
@martinperman1
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
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