Myford Super 7 Top Slide Base – Alternatives?

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Hillclimber on 08/10/2019 14:07:00:

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It is difficult to describe the geometry of the respective surfaces, and I have no idea how to tell the pads apart visually. But knowing that they are different, and checking for natural 'poise', I'm hoping this is the solution…

Cheers, Colin

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I think it’s simply a matter of their axis being offset from the centre of rotation of the topslide.

Can’t check, because I am a lowly 7R user.

MichaelG.

[egaParticipant @ega]

MichaelG:

You are correct; I assume the reason is to achieve a greater wedging effect.

The design is something of a compromise and I think the "lowly" version has the advantage of better clamping.

Edited By ega on 08/10/2019 15:38:41

[Michael GilliganParticipant @michaelgilligan61133]

Posted by ega on 08/10/2019 15:37:53:

You are correct; I assume the reason is to achieve a greater wedging effect.

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Thanks for the sanity-check

The logic is that if they were diametrically opposed, you could get unpredictable clamping … but as arranged it is kinematically superior because it is urged to a condition approximating ‘three point’.

MichaelG.

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Ref. Graham Meek’s thread: https://www.model-engineer.co.uk/forums/postings.asp?th=145209&p=1

Edited By Michael Gilligan on 08/10/2019 15:50:36

[egaParticipant @ega]

MichaelG:

Thanks for the link which I will pursue. In the meantime, as a patent buff, you may be interested in the three point arrangement of the Tormek work rest which I hope is clear from my photo:

The wedging action is such that when the black knurled clamp screw is loosened the rest retains its position but is readily removed.

I would accept "urge" to describe the action of the clamp here; in other situations, "bias" might be appropriate.

[egaParticipant @ega]

PS I notice that Graham Meek offered "bias" as an alternative, too.

I hope he can be persuaded to write up his adaptation.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by ega on 09/10/2019 11:19:26:

MichaelG:

Thanks for the link which I will pursue. In the meantime, as a patent buff, you may be interested in the three point arrangement of the Tormek work rest which I hope is clear from my photo:

The wedging action is such that when the black knurled clamp screw is loosened the rest retains its position but is readily removed.

I would accept "urge" to describe the action of the clamp here; in other situations, "bias" might be appropriate.

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Thanks for sharing that ^^^ … it’s neatly done

As for urge vs bias … I have no problem with either

… I was simply revelling in the fact that Gray had increased the richness of the forum’s vocabulary.

MichaelG.

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