Knurling tool

[Graham MeekParticipant @grahammeek88282]

The problem with all these types of caliper knurling tools is the Overhang. The adjuster placed between the pivot point and the knurls reduces the capacity for a given size.

In true Blue Peter style here is one I made earlier.

The adjustment is near the operator, out of harms way. Due to the force application point there is an actual mechanical advantage over the standard caliper knurl. The arms holding the knurls are much shorter thus they do not magnify the sideways movement. Not that hey can move sideways due to the construction used.

Capacity 0-50 mm, and it works straight out of the box, hence why I make my own tooling.

Regards

Gray,

[Robert Atkinson 2Participant @robertatkinson2]

Posted by Graham Meek on 01/04/2023 13:02:47:

The problem with all these types of caliper knurling tools is the Overhang. The adjuster placed between the pivot point and the knurls reduces the capacity for a given size.

In true Blue Peter style here is one I made earlier.

The adjustment is near the operator, out of harms way. Due to the force application point there is an actual mechanical advantage over the standard caliper knurl. The arms holding the knurls are much shorter thus they do not magnify the sideways movement. Not that hey can move sideways due to the construction used.

Capacity 0-50 mm, and it works straight out of the box, hence why I make my own tooling.

Regards

Gray,

Hi Gray,

You should write it up as an article for MEW.

[Clive Brown 1Participant @clivebrown1]

I made one borrowing from the Hemingway and Harold Hall designs. I liked the idea of the plates adding side support to the arms. This seems to work well in practice. Mine is sized for my Boxford. The knurls are 25mm dia. from Arc, which are perhaps a bit larger than most. The rest is mainly from material "in stock". Maximum working diameter is 50mm.

[VicParticipant @vic]

This is the one I made from materials I had to hand.

[Graham MeekParticipant @grahammeek88282]

Posted by Robert Atkinson 2 on 01/04/2023 13:06:09:

Hi Gray,

You should write it up as an article for MEW.

Hi Robert,

I wrote this up as an article with EiM back in Nov 2013, pages 149-153.

I may well have submitted this to MEW many years ago, but I do not recall it being published. I know I have several items still waiting to be published with MEW, this may be among them.

Unfortunately the timescale between submission and actual printing does nothing to help with my memory.

Regards

Gray,

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