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Thread dial gear for 5" and Synchro
Posted: Tue 07 Jul , 2015 17:20 pm
by rpwilson
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
Re: Thread dial gear for 5" and Synchro
Posted: Wed 08 Jul , 2015 8:44 am
by Andy B
Yes please.
Andy
Re: Thread dial gear for 5" and Synchro
Posted: Wed 08 Jul , 2015 10:25 am
by rpwilson
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
Re: Thread dial gear for 5" and Synchro
Posted: Thu 03 Oct , 2019 14:22 pm
by cordell
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.
Re: Thread dial gear for 5" and Synchro
Posted: Thu 03 Oct , 2019 14:44 pm
by Andy B
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