Myford 254S – purpose of 3 grub screws around tool post?

[Dave Sawdon 1Participant @davesawdon1]

I need to replace the tool post (or "tool clamp post" ) and see that there are 3 grub screws around it in the compound slide. Their points bear on the top of the tool post foot but don't screw into it. What are they for?

Dave

Edited By Dave Sawdon 1 on 16/11/2022 17:33:09

[Dave Sawdon 1Participant @davesawdon1]

[egaParticipant @ega]

Presumably, as with the Sevens, they are for the four way toolpost ratchet.

[Dave Sawdon 1Participant @davesawdon1]

I haven't owned a "7" so don't know what they're like. The grub screws are item 5 in this extract from the 254 parts manual and described as "grub screw – plug" – so are they just plugging holes that can be used by the 4-way toolpost?

Mine has the standard clamp, as shown in the picture, but I have a size A Multifix tool post and it looks like this will fit if I sleeve the "clamp post" … but first I need to replace the bent clamp post!

[SteviegtrParticipant @steviegtr]

I believe on my Super 7 which has them. It is just to locate the post bolt. Stops it spinning when tightened. I think on mine they were just steel pins.

Steve.

[bernard towersParticipant @bernardtowers37738]

4Way toolpost ratchet screw holes

[brickyParticipant @bricky]

definately for the ratche base of the four way toolpost.

Frank

[Dave Sawdon 1Participant @davesawdon1]

Thanks everyone. I'll be using a Multifix size A toolpost (subject to checking tool height range) so will need to drill a couple of holes for the dowel pins but then will put the grub screws back and stop thinking about them.

(Steviegtr: they are in tapped holes in the compound slide but don't penetrate the foot of the tool post. There's a single steel pin to prevent rotation)

Dave

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