need help on thread/gear change settings.

[Swarf_Newbie]

[attachment=15884][attachment=15885]Ok, please bear with me.
Bought a Chinese lathe from the bay!
It's not too bad me thinks, and after some messing about by me I can get it to turn steel 350mm long down to less than 1/2 a thou...…….. over said length, to say I'm pleased is the understatement of the year! (think canine with two willies!!!)
My problem is I never got a manual with feed rates etc from the company I bought it from!
So if I can supply the gears, can anyone supply the feed rate gear settings?
I emailed the company I purchased the lathe from about feed rates, and got told "bigger gears mean smaller feeds"...…..Yeah, right f-in really helpful!!!
It's a lot to ask, but, if you don't ask, you don't get!

So.…..Headstock gear is fixed 56T,  then looking at pic, A/B C/D (E/F leadscrew)
I have 84T, 80T(x3), 72T, 60T, 52T, 50T, 40T, 33T, 20T gears.
Leadscrew is 16mm x 2mm pitch.

Seriously, any help will be mega helpful! 

Pic included if that helps any?
(1st pic needs rotating right by 90 deg.)

In the first picture gears are...…………56T headstock, (A)80/(B)33T,  (C.)20/(D)80T, 84T leadscrew....feedrate is not known to me! 

Cheers in advance peeps!

Roy.

[haroldmulder]

Not sure if this works or not but I searched Google and came up with this manual for a WM-210v lathe which looks similar to yours

Harold

[Swarf_Newbie]

Its almost identical apart from the headstock gear is only 40T, this is very similar to the manual supplied with my lathe, its fitted with a 56T headstock gear so I haven't a clue on feed rate settings!
Thanks though Harold, tis appreciated matey.  


ATB.


Roy.

[Vinny]

In your pic on the Show Me Your Lathe thread, isn't that the thread chart on the wall behind your lathe?

[Swarf_Newbie]

(10-04-2018, 04:22 PM)Vinny Wrote: In your pic on the Show Me Your Lathe thread, isn't that the thread chart on the wall behind your lathe?

Yes it is Vinny, works very well for threads(well the ones I have tried so far that is)...…...it's as much use as a chocolate fireguard for turning feed rates though mate!
Which is what I'm after.
Or am I thinking outside/around/peeking in the box! …….I could be wrong, I am a newbie! 

Cheers.

Roy.

[Vinny]

Got a dial indicator? Put it against the carriage and see how far it moves per revolution. Alternately you could calculate the gear train. That's not hard to do, but I don't remember off the top of my head how.

[Dr Stan]

(10-04-2018, 08:09 PM)Vinny Wrote: Alternately you could calculate the gear train.  That's not hard to do, but I don't remember off the top of my head how.

It's simply calculating ratios using the number of teeth on each gear.  Simple, but tedious.  Wonder if one could use a spread sheet to create a formula and just plug in the numbers?

[Vinny]

I wrote a program years ago to calculate the change gears needed for the mini-lathes (7x and 8x) but they have fewer gears than this does. A spreadsheet should be more than possible.

[Hawkeye]

There are web sites that offer calculators for this, such as this one:

http://bilar.co.uk/cgi-bin/change-gear-calculator.pl

I just Googled "change gear calculator".

[Swarf_Newbie]

Tried Vinnys method using a dial gauge and it's currently set @ 0.008 per revolution, used a metric dti so I assume its in .mm but it could be thous!!   anyways  

Cheers.

Roy.