Warco WM250v (2014-15) lead screw pitch

[Matt Homer 1Participant @matthomer1]

Anyone know the lead screw pitch on this lathe please.

older versions of WM250 appear to be 3mm

cheers

Matt

[Matt Homer 1Participant @matthomer1]

lead screw pitch

[JasonBModerator @jasonb]

Are the dials metric or imperial as the pitch will depend of that.

[Matt Homer 1Participant @matthomer1]

sorry Metric lathe

[JasonBModerator @jasonb]

I would have thought 3mm. Easy to measure or if you are looking at a lathe can you get a photo of the chart on the front of the machine then it should not be too hard to work out

[Matt Homer 1Participant @matthomer1]

ok will do when I am back home tonight.

Just been looking into cutting a 1.75 M12 thread and have looked at Journeymans info and other guys calculations for change gears ….even been creating a spreadsheet to help. Even seems the A,B,C button ratios are different to me.

[Les Jones 1Participant @lesjones1]

Hi Jason,
If it is the same as the Chester DB-10G (Which I suspect it is.) then the thread chart could give you the wrong value for the actual pitch. The DB-110G has a 48 tooth gear driving a 60 tooth gear which is where you put the first gear you can change for the gearing to the leadscrew. So though the actual pitch of the leadscrew is 2mm the effective pitch whencalculating the gearing is 1.5mm. I would suggest say turning the leadscrew exactly 10 turns and measuring how far the saddle has moved. (For Matt the pitch will then be one tenth of the distance that the saddle has moved.)

Les.

[not done it yetParticipant @notdoneityet]

Have a caliper? If so, measure ten pitches of lead screw (or movement of saddle with ten turns of the screw). Easy to calculate from that.

[JasonBModerator @jasonb]

Matt with the 40T driver fixed on the spindle you will need the corrected gear train that Journey man shows not that on the front plate.

So that is 40T on spindle driving a 30T on the first stud and a spacer (H) next to that

That 30T drives an 80T on the 2nd pin

Also on the 2nd pin is a 70T which drives a 60T on the lead screw.

Select A on the front lever to give 1:1 straight through the box.

Put a felt tip pen in the toolpost and run that down a bit of bar to check you are cutting correctly.

 

There is another gear train that would work which is what is printed on the metric 280 machines. These also have the fixed 40 T on the spindle and 3mm pitch leadscrew

40T drives 50T

50T drives 80T

70T drives 60T

Edited By JasonB on 18/08/2017 13:34:05

[Mick B1Participant @mickb1]

Posted by Matt Homer 1 on 18/08/2017 11:46:28:

Anyone know the lead screw pitch on this lathe please.

older versions of WM250 appear to be 3mm

cheers

Matt

On my WM250V – also metric – the leadscrew is definitely 2mm, but Les' comments are pertinent.

The manual and the headstock plates give changegear layouts for 1,75 pitch, and I've found them accurate for pitches I was cutting, though these happened to be Imperial.

[JasonBModerator @jasonb]

Mick, how many teeth on the gear that is fixed to the spindle? and what age is your machine?

[Matt Homer 1Participant @matthomer1]

That's the ticket Mick….2mm lead screw and spreadsheet works and the headstock plate makes sense along with the manual.

Thanks everyone.

Matt

[Les Jones 1Participant @lesjones1]

Correction to my post at 12:53 today (18th Aug.) The gear on the spindle is 45 teeth NOT 48 as I typed in my previous post.

Les.

[Mick B1Participant @mickb1]

Posted by JasonB on 18/08/2017 17:58:28:

Mick, how many teeth on the gear that is fixed to the spindle? and what age is your machine?

40 is what it says in the manual, but I ain't never counted 'em. Looks credible to me from the rather smaller 35T gear nearby.

I took delivery in April '15, and the Test Report's dated Jan '15. 3 months on a slow boat from China sounds about right.

Edited By Mick Burmeister 1 on 18/08/2017 18:55:14

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