Good Morning Joshua

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OK the cross slide compound slide and tail stock on all Daltons lathes us a 10 pitch acme thread.? Cross slide and compound slide screws on all Dalton lathes are 7/16 diameter.? The original lead screw nuts on all Daltons was made of bronze not brass.? Brass is a very poor material for lead screw nuts as it will wear very rapidly.?? In accessing the back lash or excessive play on any compound or cross slide lead screw and nut first? you have to eliminate all back lash or end play in the lead screw.? Just a little end play will result in a lot of back lash in the screw to nut fit.? The nut on the compound is a fixed thread were as the cross slide nut on a Lot 6 or Dalton 9 has a back lash adjusting feature. ??Also the cross slide screw and nut as well as the tail stock screw? and nut are left hand thread.? The compound on the other hand is a right hand thread.? One other point in making a new nut for your Dalton the taps used for making nuts of bronze are different than the ones made for other materials.? I? have a set for bronze as well as some used for other materials like brass or steel.? Bronze is very difficult to tap acme threads in were as brass or mild steel is much easier. ?Cutting the acme thread in bronze is much easier if done on a lathe using a single point threading tool though a 7/16 size thread is a bit difficult to do.? Hope this helps a little Jashua.? Pictures are ones? I took while I was working on Gregg Fosmarks of Issaquah Washington Lot 6 Dalton.? Later on I purchased the lathe from Gregg and I still have it today.? You will also note different dial rings on this lathe.? These were made by the original owner back in the 30’s when the lathe was used by and old tool maker in Seattle Washington.? I did how ever install the needle thrust bearings on all lead screws when I made the new nuts for the compound and cross slide.? For a long time we thought these dial rings were factory but after finding a new serial number Lot 6 it was equipped with the small standard dial rings Dalton used. Never understood why? Dalton made such a very good lathe but insisted on using worthless dial rings.

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Dennis

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