Mods 8 Page 3
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These are quite simple to make, in that it requires nothing more than drilling some holes on the tube and inserting the bolts. See attached sketch for suggested hole spacing.
If you don’t want to use the micro adjuster then place an M8 x 50 bolt in the end hole of the bar. Adjust its height so that a flat on the bolt head contacts the lowest part of the carriage. Lock nut the bolt in place.
If you are using the micro adjusters then insert the bolt as above but adjust its height so that the stud of the micro adjuster contacts the lowest part of the carriage. Lock nut the bolt in place.
See photographs
and sketch for details of parts and assembly
As you can see from the photographs, I have rigged up a means of measuring carriage travel. Essentially this is a good quality finely graduated steel rule held in place on the steel tube with 10 mm diameter by 3 mm thick magnets. This arrangement works quite well with the Craftsman’s Gallery replacement jaws but will be a bit of a problem with the WoodRat plastic jaws. This is because the plastic jaws “wrap under” the chassis a little and take up the gap where the rule would sit.
Having said that the clearance between rule and Craftsman’s Gallery jaw is a bit minimal. This may require machining down the back of the under hanging bit of the jaw a little and / or elongating the fixing holes on the bar so that the bar sits back a bit further away from the jaw. Elongate the holes across the bar.
The cursor is made from a piece of 12 mm wide by 3mm thick Perspex. A fine line (hairline) has been scratched on the back of it and filled with marker ink. It in turn attaches to the jaw by means of a piece of aluminium angle. Single bolt fixings – M4 - are used to facilitate vertically aligning the cursor hairline with the markings on the rule. In order to get the cursor close up to the rule I selectively packed out the cursor to aluminium angle joint with pieces of Plasticard.
It won’t be so easy to attach a cursor like this to the plastic jaws as the outer face slopes whereas on the aluminium one it does not.
See photographs for details of parts and assembly.
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