Startrite 175/275 screw threads and fence bars?

[AndyT]

Since starting to research this saw I've added yet another new hogsheads-and-fathoms thread standard to my brain (BA). I've lost count of just how many different imperial standards there are out there. Bonkers. Metric people, metric :wink:

But BA threads are metric!
Just an older sort of metric, but the definitions are in millimetres.

https://en.m.wikipedia.org/wiki/British ... ew_threads

 

[sploo]

Since starting to research this saw I've added yet another new hogsheads-and-fathoms thread standard to my brain (BA). I've lost count of just how many different imperial standards there are out there. Bonkers. Metric people, metric :wink:

But BA threads are metric!
Just an older sort of metric, but the definitions are in millimetres.

https://en.m.wikipedia.org/wiki/British ... ew_threads

Dammit. Yeah, ok. Sorta :wink:

Let's meet in the middle and say it's metric, but designed by someone smoking crack ...

"They then spoiled this by rounding to 2 significant figures in metric and then converting to inches and rounding to the thousandth of an inch."

 

[sploo]

All the manuals on that site are dated 1981.....It was probably the last time they were reprinted by Startrite. I would not assume the age of your saw by that as a reference.

If you look at anyone of those saw manuals, you will be able to see small areas have been wightened out after the individual part number details. Those whitened areas used to state the thread size where relevant for each part.

Interesting! I didn't know that.

What we need is a table of threads for each part, by approximate serial number.

 

[MikeJhn]

There's always something like this available: https://www.google.fr/search?q=stepped+ ... MgAZO_w0zM: drill out re-tap and insert.

Mike

Not seen those before (very useful to know they exist) but I need to end up with a female tapped hole, rather than a male stud, so it's just a drilling, filling, and tapping job.

In that case maybe a time insert may help: https://www.google.fr/search?q=time+ins ... 80&bih=627

Mike

 

[sploo]

There's always something like this available: https://www.google.fr/search?q=stepped+ ... MgAZO_w0zM: drill out re-tap and insert.

Mike

Not seen those before (very useful to know they exist) but I need to end up with a female tapped hole, rather than a male stud, so it's just a drilling, filling, and tapping job.

In that case maybe a time insert may help: https://www.google.fr/search?q=time+ins ... 80&bih=627

Mike

I keep meaning to sort myself out with a helicoil kit - I've had a couple of instances where it'd be useful for fixing old handplanes. The problem is that (being tight) it's always an expensive investment to fix the one thread I need to do :wink:

That said, I've just spotted a 1/2" BSW helicoil set for £24. The only worry is whether the insert tool will reach into the rod; the threaded hole is inside a 3/4" diameter, 1/4" deep, pocket in the end of the 1 1/4" rod.

I suspect I will get the helicoil though. The alternative is probably drilling it out to 14mm, epoxying in some 14mm rod, then drilling that out and tapping.