Arrand M2 Milling Bit Holder

[Mike E.Participant @mikee-85511]

Hello,

I recently acquired a vintage Arrand mill bit holder, and need to make a drawbar for it. The inside diameter appears to be 3/8″ (?) but the thread is neither metric nor imperial. Does anyone know what the thread size is, as I an unable to get any of my thread gage leaves inside to check.

Thanks, Mike

[Michael GilliganParticipant @michaelgilligan61133]

Does this help ?

http://modelengineeringnorge.weebly.com/arrand-accessories.html

MichaelG.

[Mike E.Participant @mikee-85511]

Ahh, 3/8″ Whitworth.

Thank you for the quick reply Michael !

[bernard towersParticipant @bernardtowers37738]

Isn’t that imperial?

[JasonBModerator @jasonb]

And if the inner diameter is 3/8″ how can it be a 3/8″ thread?

[Mike E.]

On 11 September 2024 at 17:06 Mike E. Said:

…I am unable to get any of my thread gage leaves inside to check.

Stick a thin sausage of blu tack to a kebab skewer, poke into the hole and move sideways. Measure the blu tak when removed.

[Author]

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