Brett

Your dial is calibrated to give the amount cut off the diameter which is twice the infeed. Common on American market machines. Often called a "Direct Reading Dial".

Allegedly better for novice and casual users because you get the size change directly instead of needing to multiply the feed by two. Personally I think it downright confusing because the topside is still calibrated as feed so you have two systems. Easy to get muddled.

I guess your DRO system is set to read feed so the DRO changes by half as much as the dial to really get you mixed up. Most lathe DRO units have a multiply by 2 setting which will bring its cross slide reading into line with the dial.

Clive.

My lathe, the Warco 220, (the Bulgarian Mashstroy C210T) also has this system whereby the dial directly indicates how much is taken off the diameter. To be fair, it took some while to get used to the fact that actual travel was half of what the dial said, but now it's second nature. For me, it was more a mental thing than a practical thing.

Perhaps a short piece of , eg, Dymotape, stuck somewhere near may help.

Peter G. Shaw

Agree that its easy enough to get used to a direct reading dial.

But given that everything else in the machine tool world works by depth of feed and that all the cutting parameters are, as they obviously have to be, specified by depth of feed it seems silly to have a different system for a trivial simplification. How hard is it to mentally multiply by 2?

If you have re-settable dials probably best answer to any confusion is to adjust things so you always finish with the dial at zero. Gets all the thinking out of the way first. None of this business of was it 0.375 or 0.357 to finish on. More professional as you get what you set too.

None of the "8@#€€ its 5 thou over" followed by scraping and scratching to get it down to size or, worse "8@#€€ its 5 thou under" followed by rapid trajectory into the scrap bin at about Mach1. If what you set isn't what you get then adjustment is easy until, after a rather short while you learn how to be right first time like the professionals.

Clive.

FWIW the OP says it's the compound slide not the topslide.

Neil

He also mentions it's " on the carrage"?

Grizzley give Cross slide as 0.002" per division direct reading = 0.2" off dia per rev and top/compound as 0.001" per division = 0.1" off length per rev in the manual.

Edited By JasonB on 19/02/2018 13:23:39

But the carriage is normally used to position the crosslide correctly along the bed, and the OP said it was the 'combound'.

I think that what engineers do is make what they want using what they have, so I think I'd better not comment further.