How big can you go?

How big can you go?

This topic has 3 replies, 3 voices, and was last updated 29 September 2025 at 10:07 by JasonB.

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28 September 2025 at 21:04 #817782
Robert Atkinson 2
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@robertatkinson2
How big a boring bar can you use on a Myford Super 7? 8mm shank maybe 12mm 1/2″ at a push?
How about an inch? This one must be at least that if not bigger.
https://hmvf.co.uk/topic/314-ww1-dennis-truck-find/page/80/
Fo scale the work piece is a 2 3/16″ bore wheel bearing for a first world war truck.
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29 September 2025 at 07:50 #817819
JasonB
Moderator
@jasonb
As good example for Dave as to why someone may want to use larger than 12mm tooling on a small lathe.

Not having a Myford I can’t answer what is the biggest but on the 280 I have used upto 28mm dia bars, only seem to have the 25mm one in shot.

I do have a bigger between ctrs bar @ 35mm
29 September 2025 at 09:18 #817840
SillyOldDuffer
Moderator
@sillyoldduffer
On 29 September 2025 at 07:50 JasonB Said:

As good example for Dave as to why someone may want to use larger than 12mm tooling on a small lathe.

Examples, but not good ones! Valid technique, but not relevant to Rowen’s endeavour! He’s interested in mounting 12mm tools in a QCTP, not tools mounted on the saddle.

Dave
29 September 2025 at 10:07 #817858
JasonB
Moderator
@jasonb
Dave that is why my first image shows a tool held using a toolpost. I’ve used a similar clamping arrangement with the Dickson QCTP in the past when I did not have a 4-way for the previous lathe.

You asked why people would want to use larger than 12mm
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