Harrison Milling Machine Zaxis gib strips

[,Participant @nousername29627]

Hello again

Does anyone have any details or pictures of the later version of the vertical gib adjusters on this mill? I have the parts list but it says that "later models had their gib adjusters modified" It gives( no pictures or further details and I cannot see how to adjust the "new style" gibs (easy to understand why they were changed)

I would like to incorporate the new style during my extensive rebuild – I believe the housings for the vertical slide retainers have externally threaded bushes in them unlike mine which just has plain holes with the retaining bolts through plain holes.

I cannot give any picture as what I have already said is the total amount of information that I have been able to find – a plain Allen screw through a plain hole

Google is absolutely no use whatever!

isimbard brunel

[,Participant @nousername29627]

[Andy PughParticipant @andypugh44463]

I only just saw this. I will try to remember to take one of mine apart to photograph it.

Fundamentally there is a hollow tube with an external thread that the allen bolt pulls the rear keeper strip up against.

But there is the complication of a seat for the allen screw head.

[Andy PughParticipant @andypugh44463]

I finally got round to taking a photo.

The front face of the knee has 3 counterbored and threaded holes on each side.

Into each hole is threaded a tubular screw, with clearance through the middle for a 5/16 UNC cap-head screw.

Sitting in the counterbore in the knee there is a widget which is itself counterbored for the screw head and which has a pair of prongs that engage in slots in the tubular screw.

To tighten the gib you loosen the cap screw then, using a special tool, rotate the "widget" which backs out the tubular screw a fraction. Yo can then re-tighten the cap screw which clamps everything up tight, including locking the "widget" in the counterbore.

Special tool:

Not-very-technical drawing. No design work here, needs clearances and tolerances sorting out.

[,Participant @nousername29627]

Hi Andy,

That's perfect thanks – now I know exactly what the parts list is saying (why Harrisons' thought that just listing some part numbers without showing a picture was O.K remains beyond me) I will turn up the necessary parts and incorporate then in my rebuild. Machine is now starting to look good again and I have got rid of all the looseness and slack and with the 'Z' axis finally incorporating the adjustment modifications and all the oil ways clear iof the old congealed grease everything runs very smoothly indeed.

Thanks again for taking the time and trouble for sending me all the information and photos. Phil M

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