Modifications to the cross-slide for the portable Rose Engine

As this cross-slide is metric and the current graduations on the compound handwheel are only 0-39 rather than 0-10 with intermediate graduations I decided to look for an alternative that allowed the resetting of the graduated dial. I found this one on Temu

At the time I bought it the cost was £17 but I see that it has since increased slightly in price. As the 8mm hole in the centre of the new hand-wheel had a keyway slot in it and it wasn’t deep enough to use the mounting threads on the lead screw I mounted it on my metal lathe and bored and reamed the centre hole to 14mm. I then turned a T shaped steel spacer with a M10 thread in the centre that I press fitted into the 14mm hole and used Loctite to keep it in place. I then used a 1mm thick brass washer to separate  the hand-wheel from the mounting and used the conventional second nut to reduce the backlash in the compound and to lock the hand-wheel in place. The graduated dial is slightly larger than fixed base but for my use I don’t think that this will be an issue.

The cross-slide has a similar problem with the graduations and I happened to have a larger ring with suitable graduations on it but the centre bore was too large to fit. As a result I left the existing small graduated ring in place and 3D printed a spacer that grips the small ring tightly and has just enough friction to retain the outer ring but to allow it to be moved if necessary. If the spacer wears and becomes loose I can always print another or look to make it in Delrin or similar.