Allowance for Slip Fit - Additional Allowance applied to GO NO GO Plug Gage

Caster

An Early Cover
Trusted Information Resource
#1
Help - a bit of a heated debate going on here today

Can additional allowances be applied to a GO NO GO plug gage?

For example an "allowance for slip fit"

Yes or No would be great, but can you please also point me to an authoritative reference document one way or the other.

Thanks
 
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Jim Wynne

Staff member
Admin
#2
Re: Additional allowance applied to plug gage

Help - a bit of a heated debate going on here today

Can additional allowances be applied to a GO NO GO plug gage?

For example an "allowance for slip fit"

Yes or No would be great, but can you please also point me to an authoritative reference document one way or the other.

Thanks
What's the application? What's meant by "slip fit"? In general, it's expected that a go or no-go member will either fit or not fit, and it sounds like someone's trying to add some sort of fudge factor.
 

Kales Veggie

People: The Vital Few
#3
Re: Additional allowance applied to plug gage

Is your heated debate about designing the Go/NoGo plug dimensions or using it?

If it is the first (design), it depends on the final application and your customer requirements. I recall a shaft OD and a bearing ID having a 5 micron difference between maximum shaft OD and minimum Bearing ID, for example.

If it is the second (use), Jim is correct.
 
Last edited:

michellemmm

Quest For Quality
#4
Re: Additional allowance applied to plug gage

What's the application? What's meant by "slip fit"? In general, it's expected that a go or no-go member will either fit or not fit, and it sounds like someone's trying to add some sort of fudge factor.
It has been years... I have not been involved in gage design since college... So, please feel free to correct me if my memory is deteriorated.

In England, there are three classes of fit:
1- Running or slip fit.
2- Interference fit
3- Press fit.

The allowance we used to add.... was "wear allowance" which was added to maximum material condition.
 
W

world quality

#5
Re: Additional allowance applied to plug gage

Maybe what I see is the old way of ordering gages for plug and ring.
Tolerance as stated at end
xx- precision lapped ( Plugs or Male Masters.
x - Precision lapped ring and plugs
Y - Lapped plug or ring
z - ground and polished
zz - Grounded only
This can range between 0.00002 to 0.0008 for tolerance due to size.
 

Caster

An Early Cover
Trusted Information Resource
#6
Re: Additional allowance applied to plug gage

Is your heated debate about designing the Go/NoGo plug dimensions or using it?If it is the first (design), it depends on the final application and your customer requirements. I recall a shaft OD and a bearing ID having a 5 micron difference between maximum shaft OD and minimum Bearing ID, for example.If it is the second (use), Jim is correct.
The customer print calls out a size and a tolerance. We happen to know (or at least we think we know) that the shaft that our hole fits over is much smaller. But this is not shown on our print.

It seems the arguement is that if we get really close to the gage size it gets stuck, so some people wish to apply a slip fit allowance. But then what will happen when we get close to that size?

The debate seems to have settled down for now. We're going to do "a study".

The only place I ever found a description of how to size a plug gage was in the Machinery Handbook, but I don't have a copy right now.

Has anyone got any links?
 

Stijloor

Staff member
Super Moderator
#7
Re: Additional allowance applied to plug gage

The customer print calls out a size and a tolerance. We happen to know (or at least we think we know) that the shaft that our hole fits over is much smaller. But this is not shown on our print.

It seems the arguement is that if we get really close to the gage size it gets stuck, so some people wish to apply a slip fit allowance. But then what will happen when we get close to that size?

The debate seems to have settled down for now. We're going to do "a study".

The only place I ever found a description of how to size a plug gage was in the Machinery Handbook, but I don't have a copy right now.

Has anyone got any links?

Hello Caster,

Machinery's Handbook. You can even search in this book.

Hope this helps.

Stijloor.
 

Caster

An Early Cover
Trusted Information Resource
#8
Re: Additional allowance applied to plug gage

The only place I ever found a description of how to size a plug gage was in the Machinery Handbook, but I don't have a copy right now. Has anyone got any links?
OK, I found this helpful link, posted here for anyone else with this situation

http://www.vermontgage.com/tech/archive/rules.pdf

Page 4 tells all...including the always mysterious X, XX, Y, ZZ class defined so I can understand it!

Thanks to Vermont Gage!
 
U

Umang Vidyarthi

#9
Help - a bit of a heated debate going on here today

Can additional allowances be applied to a GO NO GO plug gage?

For example an "allowance for slip fit"

Yes or No would be great, but can you please also point me to an authoritative reference document one way or the other.

Thanks
IMO the title is not correctly worded,since Slip Fit (and for that matter,press fit/shrink fit/force fit etc.) is not applicable for GO/NOGO plug gages.

/Umang :cool:
 
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