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Internal threading

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Brass_Machine:
SO I am trying to help one of our members with some anti-backlash nuts for the micromill (X1). It looks like he has the metric version (being in the UK and all). The threads are 12mm x 2.0  From what I have seen, taps for this are outrageously expensive. I was thinking about doing some internal threading on the lathe. However, I have NO threading experience on it at all.

Suggestions on where to start?

Eric

bogstandard:
I had a quickie look on my normal sites for 12x2mm taps, but none list them, so as you say, they are most probably very expensive specials.

Before you even start, I think the main problem you will have Eric, is your lathe.

Being from the US I assume it is an imperial machine, that if set up with a range of change gears, can cut a pitch SIMILAR to a metric thread. That means, I don't think you will be able to cut the thread to the critical exact pitch that you require, you will require it to be done on a metric machine with a metric leadscrew.

You would need to get your change gear charts out and see just how close you can get to ideal pitch using your imperial leadscrew.
You just might be lucky and find one that gets it spot on, but I doubt it very much.

As usual, the bearer of bad tidings.

Bad news Bogs.

CrewCab:
Eric,
I can find 12x1.25, 1.5 and 1.75 but not 12x2  :scratch: ................. is this a Chinese special ...    :smart: ....  just to be sure can you double check the size please ........... just a thought  :thumbup:

CC

Brass_Machine:

--- Quote from: CrewCab on June 11, 2009, 04:07:06 PM ---Eric,
I can find 12x1.25, 1.5 and 1.75 but not 12x2  :scratch: ................. is this a Chinese special ...    :smart: ....  just to be sure can you double check the size please ........... just a thought  :thumbup:

CC

--- End quote ---

Yup. It is an acme trapezoidal thread. I do believe that is it. This would be for the lead screws on the seig X1 micromill.

Eric

Darren:
A    B    C    D    Thread Pitch    Percent Error    Error in 10 Pitches
40    35    55    50    1.996 mm             0.215%    0.0214 mm
40    50    55    35    1.996 mm             0.215%    0.0214 mm
55    35    40    50    1.996 mm             0.215%    0.0214 mm

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