WARCO WM180

[Geoffrey FairhurstParticipant @geoffreyfairhurst38361]

Hello all .After retiring I bought a WARCO WM 180 IMPERIAL LATHE three years ago and have made several modifications to lathe and a few model engines and I am still learning how to do things.
However to the point, I do not fully understand the label on the machine which refers to the thread dial indicator .The top of the label indicates a 12 tpi lead screw,48T is the number of teeth on the indicator.I wonder if any member can help explain parts of the rest.The manual supplied is virtually useless and out of date

.

[Geoffrey FairhurstParticipant @geoffreyfairhurst38361]

Threading label

[mechman48Participant @mechman48]

As far as I can make out on the left hand scale n/1" = number of threads per inch ( tpi ), below that I suspect that 9, 5 tpi indicates that you use numbers 2 & 4 on the dial, the rest of the table says to me that you can use any whole number from 1 – 4 on the dial. Maybe some one with a 180 can confirm or offer another ' guestimate'

George.

[John RuddParticipant @johnrudd16576]

I dont have a WM180, but I concur with George about the how the table reads.

[Martin ConnellyParticipant @martinconnelly55370]

This label seems to be saying that you have a 12 thread per inch lead screw. The threading dial gear that engages with it is module 0.7 with 48 teeth. This gear has a pitch circle diameter of 0.7 x 48 giving 33.6mm.

12 tpi into 48 gives 4 so I believe the threading dial will rotate once every 4" of carriage travel or 1/4 of a turn per inch of travel. If the dial is divided into 4 then each mark will show 1" of travel. This means that for any thread with a whole number of threads per inch you can engage the half nuts at any mark on the dial. For threads with 9.5 or 11.5 tpi you need to travel 2" to get to the place where you can engage the half nuts. That requires the thread dial turning 180 degrees so you should engage at opposite marks such as 1 and 3 or 2 and 4. The makers have picked the even numbers but could just as easily picked the odd numbers.

Martin C

https://www.model-engineer.co.uk/albums/member_album.asp?a=46824

Link above is to my album on understanding the threading dial. 

Edited By Martin Connelly on 22/10/2018 19:25:07

[Geoffrey FairhurstParticipant @geoffreyfairhurst38361]

Thank you George ,John and especially Martin C for his detailed reply. Geoff

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