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J&S 540 Carriage Lock ????

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awemawson:
I'm sure that a lot of you have J&S 540 surface grinders or have used them when working. Do they have a carriage lock  :scratch:

I was setting up today to grind a JT33 taper on some tooling, and as the cylindrical grinder is currently set up nuts on to grind parallel I didn't want to disturb it. So as the JT33 is only a short taper I thought that I'd use the 'Unigrind' sat on a sine table on the J&S 540.

The sine table gets tilted to the 'half angle' of the taper. The part is set in the Unigrind V block and adjusted for zero run-out. Then the assembly gets put under the wheel of the surface grinder with the table locked, so no X movement, and the part is rotated in the Unigrind forming the taper.

ALL VERY WELL IF YOU CAN FIND THE TABLE LOCK  :bang:

Then I went searching for my copy of the manual - yes you guessed - lent it to someone and it's never come back. Diligent search on the machine revealed a useful looking mystery tapped hole in the sliding carriage - looks to be 1/4" UNC. Tentative gentle screwing of suitable bolt ...... did nothing  :bang:

Surely there must have been provision for locking the table in the long movement  :scratch: :scratch: :scratch: Blowed if I can find it if there is

j1312v:
Hi Andrew,

For what I can see in the images your machine doesn't have the small bracket to attach a "stop block" (first picture).

I don't have the block, so I improvised a stop with a small vice (second picture)
 
To lock the table you have to set the dogs against the stop and voilą.

Hope that helps.

Best, J

awemawson:
Thanks for that j1312v.

I must venture out to the workshop and see what there is in that area. Do you think that that bracket is  original, or something a previous owner has improvised ?

j1312v:
I have seen lots of 540s and that bracket is mainly in the recent models(70's 80's), perhaps J&S have something else for the early models.

Best,

Joe

awemawson:
Ah ... I think that mine is 1957 ... so quite modern really   :lol:

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