not ideal perhaps, but i'm going to use a PCL air fitting for my axle breather. its something i'll be able to replace easy enough if i ever need to etc.

the thread i believe is 1/4" BSP, so i'm going to cut that into my axle tube. what size drill do i need?

preferably in mm. 10 or 12mm?

11.8 mm is drill size for 1/4 BSP

Blake you need an 11.8mm drill to tap 1/4 " BSP


ETA Bu$$er. Second. Must type faster...

[Edited on 27/1/10 by MikeCapon]

1/4 BSP is 11.8mm drill size for tapping.

Information from here

Ed.
Edit: Too late again! 3 answers all at the same time.

[Edited on 27/1/10 by Madinventions]

nice one cheers guys
would 12mm be ok? i fancy my chances of finding a 12mm drill better than 11.8mm

the PCL fitting is a taper thread if that makes a difference?

Taper thread 11.2mm...

11mm then?
or 11mm then open out a little with dremmel?

years ago i had to re tap a thread which a weld penetrated a long way into (about 4mm)
i ran the tap down with lots of grease, and it wore away at the weld perfectly. so while 11.8 or 11.2 for the taper is the most ideal one, will 11mm do it?
i can't afford to be getting special drill sizes and stuff i just wanted to get it done

You could use an imperial sized drill which is 7/16'' = 11.1mm and I have used this size before without any problems

If its thinish casing i think you would get away with a 11m, opened out a bit maybe.
- Can certainly try it and see how it goes, just dont force the tap and snap it. Anywhere that sells taps will sell tap drills to suit.


Daniel

if its a taper thread make sure you tap it to the correct depth or the taper is a waste of time....

am i right in thinking i'd put a normal thread into the axle if the air line fitting is tapered?

the axle tube is about 10mm thick i think. i can't remember.

i hate threads they confuse the hell out of me

Drill a hole in the axle and weld a nut to it to take the fitting. What axle is it at 10mm thick ? That is really heavy most are more like 2mm.

[Edited on 27/1/10 by Peteff]

quote:

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Originally posted by Peteff
Drill a hole in the axle and weld a nut to it to take the fitting. What axle is it at 10mm thick ? That is really heavy most are more like 2mm.

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