Starrett KA19-N Oops Arbor - Two hole saws on one arbour

Midwest · Nov 24, 2017

I know someone posted on this subject quite recently, but can't find it, regarding a new arbour which you can fit two hole saws, one to act as a pilot to enlarge an existing hole.

I tend to use the old 'cut at an angle' trick with the larger hole saw, but I've got a 60min ceiling thickness, and it's gonna make a bit of a mess with that trick.

Can't find that thread, googled and found the above Starrett one, but I thought it was something newer?

Wilko · Nov 24, 2017

Hi MW, here's another one ...
Adoxim Arbor - Enlarge Existing Holes - https://www.tlc-direct.co.uk/Products/FXSRDA1.html

[ElectriciansForums.net] Starrett KA19-N Oops Arbor - Two hole saws on one arbour

rsgaz · Nov 24, 2017

Have you looked closely at your current holesaw arbour?
There may be a little bit of thread poking through the bigger holesaw, which you can just about thread on the smaller size.

Trickier to separate after if the 'anti-jam' pins won't reach the front holesaw, so put some grease where the holesaws contact each other.

mhar · Nov 24, 2017

I just get something like a bit of 5-10mm ply and make the required size hole in it and use it as a template (holding it in place whilst drilling the new hole

Octopus · Nov 24, 2017

My "Old" Arbor will allow you to use 2 hole saws ...

Have you tried the one you have?

Midwest · Nov 24, 2017

rsgaz said:
Have you looked closely at your current holesaw arbour?
There may be a little bit of thread poking through the bigger holesaw, which you can just about thread on the smaller size.

Trickier to separate after if the 'anti-jam' pins won't reach the front holesaw, so put some grease where the holesaws contact each other.

Thanks, I'll have a look. Both me arbours are ancient, circa 1980 and one is jammed with a hole saw

Jim90 · Nov 24, 2017

Drilling 25mm holes and the 20mm knockout comes out of a box and you have to put like a reel of tape around a 20mm wholesaw to fit snuggly in a 25mm wholesaw!
Those were the days. Too poor to buy cone cutters!

123 · Nov 24, 2017

CK also do one, I think it's slightly cheaper, here

sam400 · Nov 24, 2017

Oops arbors are brilliant ,well worth having in your holesaw set. It's got me out of bother a few times now.

Sam

Midwest · Nov 25, 2017

How do these arbours fit into your existing arbour or do they? Looking at the Starrett web site, they seem to have different shanks for different arbours.

123 · Nov 25, 2017

They replace the 6mm pilot bit

Starrett KA19-N Oops Arbor - Two hole saws on one arbour

Midwest

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Wilko

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rsgaz

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mhar

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Octopus

Midwest

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Jim90

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123

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sam400

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Midwest

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123

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