Trials and tribulations with a 7x12 lathe

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modeldozer:
Hi to all form a very happy modder :) :D :ddb:.

After making lots of shims, sanding and tweeking it is all adjusted and working nicely. Up/down play at all 4 corners less than 0.01mm and ....... the rotational down to just under 0.01mm ( do not have anything that measures finer)

I would like to take a moment to thank everybody for their advice, information and support, without witch I most probably would have given up long ago. So to all have a few on me :beer: :beer: :beer: :beer:.

And :mmr:

More to follow soon.
Abraham

loply:
Morning Abraham,

Probably a bit late now but I got my shim stock just off eBay somewhere - just searched for 'brass shim' or something.

Congrats on finishing the tine tuning, certainly sounds like it ought to be smooth as hell now.

May I ask how you managed to measure the slant on the saddle gib? And how did you manage to sand the saddle flat with accuracy?

modeldozer:
Hi Rich,

Had to do a bit of :scratch:, I will try to explain.
First measured from the top side surface to the bottom faces where the gibs mount at all 4 corners then at the back between same top surface and the rear flat sliding surface at the bottom, at the front i used a 6mm guide rod from an old printer in the "v" and measured between it and the top, this gave me 8 readings. Then calculate the dfference between the readings for the gib mounts and slide surfaces at each corner, now 4 values. Next i calculated the difference letf/right for the front and the back. Then it was a matter of carefull filing to remove the exess on the high points and finishing on a piece of 360 W&D on my lapping glass.
I will try to do a C-o-C to clear it up if necessary.

Abraham

modeldozer:
Hi all,

Next are some modifications to the lead screw guard supports. The right hand one had an extension piece to allow for the thread indicator to locate, as I do not use it and will be adding DROs, the extension was removed and the pieces soft soldered with lead free solder (do not have silver soldering equipment). From the heat when soldered the blackening of the pieces came off. My only option was to paint the parts. The left hand one had a piece added to cover the opening on the slanted apron.

Both finished with the template that was used to make the add on piece.

Lead screw installed and some close ups. The mod on the right extended the travel by some 30mm.

Today made one C-spanner and started the other for the castle nuts on the spindle.

Abraham

Henning:
Nice work this far! :headbang:

I notice you have covered the lead screw. Where did you find the cover? I got one half of a "full size" one the other day and was wondering if i could cut that in two and use that, but i have other things on at the moment so so far it's just sat there on my bench.

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