Thread: Need a quote on these.

Hi Nev,
Whats the tolerance?
Any reason you can't use boring old MS?

Stuart

Forgot something so here's the second drawing. There needs to be a small groove for a 1mm snap ring in the position shown as yellow on the drawing. This is 65.5mm from top of 12.95mm section of shaft and is where the centre of groove will be so top of snap ring wll be 65mm from this. Depth of groove is 1mm.

Drawing is not to scale.

Nev

Originally Posted by Stustoys

Hi Nev,
Whats the tolerance?
Any reason you can't use boring old MS?

Stuart

Tolerance, good question. + or - 0.02mm? Is that asking too much? Snap ring groove can be +0.02mm but not under 1mm.

Not sure, as this is part of a tool that will see the internal threaded section used hundreds, maybe thousands of times and has to stand up to this, along with the ability to not be damaged under axial load.

Nev

4140 would be ok.

Bit of a problem with your diameter,is it 11.95 or 12.95 mm.

Is the groove 1mm deep overall giving a reduction in diameter of 1mm,or 1mm deep giving a reduction of 2mm in diameter.

The size of 11.95 or 12.95 mm,does this slide into something.

How critical is it that the 10mm thread and the internal thread are in line with each other.

Is it critical for the internal threads to be the length stated or can they be longer.

Does the internal hole need to have a flat bottom.

Originally Posted by pipeclay

Bit of a problem with your diameter,is it 11.95 or 12.95 mm.

11.95mm

Originally Posted by pipeclay

Is the groove 1mm deep overall giving a reduction in diameter of 1mm,or 1mm deep giving a reduction of 2mm in diameter.

2mm overall reduction on diameter.

Originally Posted by pipeclay

The size of 11.95 or 12.95 mm,does this slide into something.

Yes slides into tool and the snap ring just prevents it falling out but is easily removed.

Originally Posted by pipeclay

How critical is it that the 10mm thread and the internal thread are in line with each other.

Not critical but as close as possible. More important for the internal thread to be in line with the shaft.

Originally Posted by pipeclay

Is it critical for the internal threads to be the length stated or can they be longer.

Could be longer but prefer the lengths stated.

Originally Posted by pipeclay

Does the internal hole need to have a flat bottom.

No.

Nev

Discovered a major flaw in the one with the 10mm internal thread. There is not enough metal in the shaft to have a 55mm depth of thread because of the snap ring position so this needs to be reduced to 45mm.

Nev

Will a 12mm shank drill fit in the bore.

Originally Posted by pipeclay

Will a 12mm shank drill fit in the bore.

Yes, just tried a brand new drill. Drill shank measure 11.95mm though. Do you want to know if tool will take a 12mm shaft?

Nev

Yes,can get material in 12 mm od, without having to machine .05mm would be good.

ok, just tested the bore of the tool with a 12mm transfer punch and it fits just fine. I was going by measurements on the other shafts for the tool, but they allow a fair bit of clearance.

Nev

The relief you refer to on the od thread is an undercut,is there any reason why this could not be 2 to 4 mm wide.

Originally Posted by pipeclay

The relief you refer to on the od thread is an undercut,is there any reason why this could not be 2 to 4 mm wide.

Change of plans. Eliminate the male thread on end of shaft. An internal thread of 10 X 1.5mm to a depth of 20mm on a 12mm shaft 115mm in length would I think be a better option and easier to do. I need to fit another piece to this end of shaft so that would also make it easier for me.

Can you see any problem with having the 10mm thread in the 12mm shaft regarding wall thickness that remains?

Nev

The only problem you will have is if you put to much side load on it,it could bend.

If you were going to screw something into it and then machine it,you would have to be careful about you depth of cut and feed rate, unless the end of the part was supported.