Sunday, June 20, 2010

Shimming The Dovetail To Align The Y Axis

 

Refer to my setup guides, V1, V2 part 1, V2 Part 2 first.

tram01

Sweep the indicator mounted in the spindle on the Y-axis. A 6” parallel is useful as you gain some diameter.

tram02

Note whether it’s higher in the back or the front.

tram03

Remove the headstock, revealing the dovetail plate.

tram04

Loosen the screws on the plate and insert a shim. Start with a .001” thick shim.

tram05

Depending on the condition you may have to shim the top or the bottom. You will have to realign the dovetail plate in X after this and tram again. This can make you crazy and you will probably have to do this a couple of times.  Don’t try to get it perfect.

002

Here’s a shim peeking out from under my headstock.

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