Model Boat Mayhem

The Shipyard ( Dry Dock ): Builds & Questions => Steam => Topic started by: Landlocked on April 09, 2011, 04:15:16 am

Title: Mixing Metric and Inch Sizes
Post by: Landlocked on April 09, 2011, 04:15:16 am

Are there big issues trying to mix inch and metric size tubing and fittings?

Is 3mm close enough to 1/8 in and 4mm to 5/32 to allow for strong enough joints?

I like the Anton gas pressure regulator with low pressure cut off but my other fittings are inch based. 

Landlocked

Title: Re: Mixing Metric and Inch Sizes
Post by: tigertiger on April 09, 2011, 06:32:38 am

This subject has come up before, I am almost certain.
Do a search on the steam sections of the forum.
Also, try the Nautical College board and the Research and Design office boards as well.

Title: Re: Mixing Metric and Inch Sizes
Post by: Aeronut4 on April 09, 2011, 09:05:57 am

4mm is 0.1575" and 5/32 is 0.15625", so close enough not to matter in most cases. 3mm is 0.118" and 1/8" is 0.125, so a bit more difference there. 3mm pipe will be very slack in 1/8 fittings and 1/8 pipe won't fit 3mm fittings.  If you have a lathe, or know someone who has, it's easy enough to get round the problem.

Title: Re: Mixing Metric and Inch Sizes
Post by: derekwarner on April 09, 2011, 10:22:16 am

Hullo ...Landlocked......most Anton gas regulating components........& yes there are four available are soft sealed [o-ring sealing] but on 2.0 OD mm tubing

Do not be confused here with comments of "pipe" ......all of the tube components used here are OD tubing

The word pipe   >>:-( relates to nominal bore <*<

Should you decide to go the Anton way......it is relatively simple to soft solder capilliary telescopic tubing between your imperial tube sizes back to metric & back again..... :-)) ....Derek


  

Title: Re: Mixing Metric and Inch Sizes
Post by: JJS on April 09, 2011, 10:50:30 pm

Hi I have connected anton metric regulators to inch piping, and Metric Oiler to inch piping. Everything works well

JJS
(http://s2.postimage.org/261zm7ihw/DSCN0071.jpg) (http://postimage.org/image/261zm7ihw/)

(http://s2.postimage.org/2624ktjz8/DSCN0069.jpg) (http://postimage.org/image/2624ktjz8/)

Title: Re: Mixing Metric and Inch Sizes
Post by: Circlip on April 10, 2011, 09:22:45 am

Don't mix Metric with Imperial size tubes/fittings unless using a correctly sized adapter which invariably means access to a lathe. This only applies to the UK, let everyone else please themselves.

  Regards  Ian.