mill vertical head

[mark smith 20Participant @marksmith20]

Hi, just been reading the thread about mill squareness checking.

On the mill im restoring i have this plate on the front of the vertical head something about 001 to the right  , can anyone with more knowledge than me explain what its referring to .

The actual head has a different machine number ,(only 4 difference) than the arm holding it.

Is it some adjustment made by the manufacturer for a replacement head or??

Its an GH Alexander mill .

Thanks

 

 

Edited By mark smith 20 on 08/10/2016 19:43:08

Edited By mark smith 20 on 08/10/2016 19:43:46

[mark smith 20Participant @marksmith20]

[Clive FosterParticipant @clivefoster55965]

Means exactly what it says.

The axis of the vertical spindle when mounted on the machine via the (correctly adjusted) overarm dovetail was 0.001" to the right of the horizontal spindle axis when the machine was made (or when it was re-built). Exactly what the variation is now will depend on how much and where wear has taken place.

When you think about it its clearly quite difficult to make these "Deckel style" machines so that the vertical spindle axis is exactly co-incident with the horizontal one. Close or pretty darn close being much more likely unless extre measures are taken. Given that there is an offset its nice to know how much. That said I have difficulty thinking of any job where you'd define the axis setting off one spindle and expect it to transfer directly to the other one without intermediate verification. These were after all sophisticated toolroom machines intended for very accurate work requiring great flexibility in the angle at which the cutter approaches the work so lots of checking before cutting would be normal procedure.

Clive

Edited By Clive Foster on 08/10/2016 21:19:39

[mark smith 20Participant @marksmith20]

Thanks Clive, you`ve explained it very well .

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