Thread dial gear for 5" and Synchro

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rpwilson
CNC Expert
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Posts: 155
Joined: Tue 03 Jun , 2014 15:20 pm
Hardware/Software: None. I own a pre CNC Denford 280 Synchro lathe.

Thread dial gear for 5" and Synchro

Post by rpwilson » Tue 07 Jul , 2015 17:20 pm

I need to cut a 28T gear for the thread dial on my metric Synchro, to supplement the more commonly found 30T gear. Cutting it isn't a problem, just have to incline the dividing head over slightly to skew the teeth to match the pitch of the leadscrew. I believe that this component is common to metric 5" and the Synchro range, so does anyone else need one while I'm set up to do mine?

Richard

Andy B
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Hardware/Software: 280 VS lathe, Denford Senior E-type mill, Senior Major Universal Mill
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Re: Thread dial gear for 5" and Synchro

Post by Andy B » Wed 08 Jul , 2015 8:44 am

Yes please.

Andy

rpwilson
CNC Expert
CNC Expert
Posts: 155
Joined: Tue 03 Jun , 2014 15:20 pm
Hardware/Software: None. I own a pre CNC Denford 280 Synchro lathe.

Re: Thread dial gear for 5" and Synchro

Post by rpwilson » Wed 08 Jul , 2015 10:25 am

OK Andy, duly noted. I've turned some blanks, just waiting to see if my ebay bid on a 24DP cutter is successful.

Anybody need a 30T gear for a thread dial indicator? I've got a spare one.

Richard

cordell
Posts: 1
Joined: Thu 03 Oct , 2019 14:08 pm
Hardware/Software: Freecad, Denford viceroy TDS 1 S.C.L

Re: Thread dial gear for 5" and Synchro

Post by cordell » Thu 03 Oct , 2019 14:22 pm

Hi

I have a viceroy TDS 1 S.C.L with a 3mm lead screw. It is missing the thread dial indicator.
Can you explain what the difference between the T28 and T30 Thread dial gears please.

Andy B
CNC Guru
CNC Guru
Posts: 396
Joined: Mon 20 Nov , 2006 18:19 pm
Hardware/Software: 280 VS lathe, Denford Senior E-type mill, Senior Major Universal Mill
Location: East Midlands, UK

Re: Thread dial gear for 5" and Synchro

Post by Andy B » Thu 03 Oct , 2019 14:44 pm

One has 28 teeth, the other has 30 teeth.

The 28 tooth gear is needed to indicate correctly on pitches of 0.35, 0.7, 0.8, 1.4, 1.75 & 3.5mm.
The 30 tooth gear is needed to indicate correctly on pitches of 1.25, 2.5.

All other 'standard' metric pitches (<4mm) can be done with either gear.

It's all in the maths - whether the dividing factors of the number of gear teeth are multiples of the required pitch to cut.
There's a calculator [urlhttps://www.cgtk.co.uk/metalwork/reference/threaddialindicator]here [/url]that shows the gaps.

Hope that explains.

Andy

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