Calibration of height gauge

[Andrew EvansParticipant @andrewevans67134]

Hello All. Can anyone help me out? I have a 12″ vernier height gauge by Chesterman – its a beautifully made tool, from the 1950’s judging by the style of the literature in the box.

 

Judging by the included ‘master’ height (a cylinder of exactly 1.5″ height) it is reading about 0.005″ on the high side (so it reads 1.505″). Does anyone know if its possible to recalibrate the gauge – I cannot see a way to do it?

 

Thanks in advance.

 

Andy

 

p.s. as an aside did you know that the singer Joan Armatrading worked for Rabone Chesterman?

[Andrew EvansParticipant @andrewevans67134]

[JasonBModerator @jasonb]

Ther should be a locking screw at the top of the column which allows the whole scale to move up and down, loosen this off and use the adjusting screw until you get the right setting.

 

J

[Nicholas FarrParticipant @nicholasfarr14254]

Hi, I have a Chesterman No. 369. It does not have any means of adjusting the scales on the column as the scales are etched into it. However, the vernier scales on the moving stock are fixed on with four screws. The holes in the vernier scales for the scews are elongated, thus allowing a small amount of adjustment.

 

Regards Nick.

[Andrew EvansParticipant @andrewevans67134]

Thanks for replying. Nick – I think mine is like yours – i can’t see a locking screw on top. I will try loosening the 4 screws on the scales and slightly adjusting (not with a hammer I hasten to add!).

 

Andy

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