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[pipercub1772]

Hi I've run into trouble with a cheddar boiler ,bottom water gauge sheered off its 1/4x32 tried the usual heat and stud extractor no joy ,drilled 5 mll and taped 1/4 32 but fitting sloppy in boiler bush  ,I'm thinking trying 5 1/6tap which i have but unsure of the drill size i need to use any thoughts there is plenty of meet on the bush itself ,kind regards Allan

[ddmckee54]

Here's a link to a German site listing the model engineering thread tap drill sizes.  They don't say what % the thread depth is though, maybe 60%?  If you're metrically challenged, there are plenty of on-line converters that will change mm to inches.
https://www.gewinde-normen.de/en/me-thread.html

[Ralf]

try to drill out from 4mm to 5,5mm and then try to get out the broken water gauge. Recut the thread if necessasary.


Much luck


Regards Ralf

[SteamboatPhil]

What is the pitch, ie, ME, BSP, BSB'  whit worth, etc as I have all the tapping size gauges

[pipercub1772]

i think its me thread i think its what cheddar used unless anyone knows for sure thanks for all replies

[Ralf]

Cheddar boiler bushes are 1/4X32TPI Model-Engineer


Regards
Ralf

[pipercub1772]

thanks I've sorted it drilled both water gauge bushes 7 mll and taped out 5 1/6 x 32 waiting for water gauge from kennions thanks for all  replies
regards Allan

[SteamboatPhil]

Glad you have got it sorted 

[CliffW]

Allan, going to the larger 5 1/16x32 ME fitting should work fine...if memory serves correctly the bush will have plenty of material for tapping to the larger size.

[pipercub1772]

thanks for the reply as you say plenty material for the larger size ,regards .