Author Topic: advice please on interfance fit  (Read 2942 times)

Offline jim

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advice please on interfance fit
« on: September 10, 2009, 12:50:57 PM »
i need to shrink fit a boss on to a shaft, i've had conflicting advice as to the amount i need the shaft bigger than the bore.

the bore is 18.2mm (.7625") its fairly solid ( up to 2" dia and 1 1/4" long.

i'm thinking about .001, is that enough??

thanks jimmyo
if i'd thought it through, i'd have never tried it

Offline sbwhart

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Re: advice please on interfance fit
« Reply #1 on: September 10, 2009, 01:27:29 PM »
Hi Jimmy

I did a bit of shrink fitting on my elbow engine I think you'll need a bit more say 0.003". What duty as the bit to do, high strength loctite is very good stuff, with a size on size or slight interfearance and loctite you'll get a good strong joint good enough for most aplications.

Have fun

Stew

A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

Offline jim

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Re: advice please on interfance fit
« Reply #2 on: September 10, 2009, 02:17:34 PM »
Hi Jimmy

I did a bit of shrink fitting on my elbow engine I think you'll need a bit more say 0.003". What duty as the bit to do, high strength loctite is very good stuff, with a size on size or slight interfearance and loctite you'll get a good strong joint good enough for most aplications.

Have fun

Stew


thanks
its for a wood cutting saw, i'm just a bit worried about getting it half on and getting stuck!

if i can get the boss red, what sort of time frame do you think i'll have and is it worth freezing the shaft (given its dia?)

cheers jim
if i'd thought it through, i'd have never tried it

Offline NickG

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Re: advice please on interfance fit
« Reply #3 on: September 10, 2009, 03:14:25 PM »
Stew, I thought you needed a clearance for the loctite to work, a bit like silver solder? Somebody correct me if I'm wrong!

Nick
Location: County Durham (North East England)

Offline sbwhart

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Re: advice please on interfance fit
« Reply #4 on: September 10, 2009, 03:32:39 PM »
Hi Nick

It will work Ok with clearance but its best with an interference.

Do you know the loctite rep he was always at RG he's also a bit of a model man, worth having a chat too he'll tell you best way to use the stuff, but not very forthcoming with free samples  :lol:

Have fun

Stew
A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

Offline NickG

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Re: advice please on interfance fit
« Reply #5 on: September 10, 2009, 04:15:19 PM »
Thanks for that Stew, didn't know that! No, don't usually get involved in things like that but might if anything become obsolete. Lol, there's some 601 or something in our fridge in the design office, it's been there at least the 8 years I've been there, do you think anyone will notice if it goes home?!  :lol: Probably gone off now anyway!
Location: County Durham (North East England)

Offline sbwhart

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Re: advice please on interfance fit
« Reply #6 on: September 11, 2009, 01:16:20 AM »
Nope the 601 will be fine, I think they just put the shelf live on it to boost sales, had quite a few old bottles years old, tested and re lived never had one fail, go for it.

Stew

A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

Offline jim

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Re: advice please on interfance fit
« Reply #7 on: September 11, 2009, 04:57:55 AM »
i went for .0015".

heated the boss up in the oven, had assist the shaft on with a lump hammer :doh:

note to self, get the paint off the bar BEFORE putting in the oven :lol: :lol:

i've decided to dill and peg the boss too, maybe overkill :scratch:
if i'd thought it through, i'd have never tried it