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Millers Falls power hacksaw

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Millers Falls power hacksaw

Post by Locknut on Thu Nov 01 2018, 11:12

Hi Guys,
The piece on the saw bed that the screw/bolt goes through to tighten the vice jaws has worn nearly smooth (see photo) by mis-use over time,in fact I did not realise that there was a screw thread in there until I cleaned it up and then I could just make out the feint outline of a thread.
I am now wanting to retap the hole but what size? The internal diameter of the hole is 11/16"ths - I did have a chart that gave the thread size for different hole sizes but now when I need it I cant find it! I was thinking that a 3/4 whitworth tap would do - any ideas?
I would add that the saw is an American one and made about 1893-1900.


Any help or advice much appreciated.Thank you.
kev.

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Re: Millers Falls power hacksaw

Post by Woodsman on Thu Nov 01 2018, 12:31

Hi Kev,

Plenty of thread charts around on t'interweb - here's a start

http://www.baconsdozen.co.uk/tools/conversion%20charts.htm

https://www.gwr-fasteners.co.uk/thread-dimensions-4-w.asp

Being American thread might have been UNC - often same diameter and pitch as BSW but different thread form. (60deg v 55 deg flat top v rounded)

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Re: Millers Falls power hacksaw

Post by Locknut on Thu Nov 01 2018, 18:53

Hi Paul,
Thanks for that.
You are right being American the origenal thread could well have been UNC. I will look into those sites and see what they show.
Kev.

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Re: Millers Falls power hacksaw

Post by Woodsman on Fri Nov 02 2018, 09:12

Locknut wrote:Hi Paul,
Thanks for that.
You are right being American the origenal thread could well have been UNC. I will look into those sites and see what they show.
Kev.

Hi Kev,
I have saved quite a few as spreadsheets. If it will save time, PM me with email address and I'll send them.

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