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Author Topic: Rotary table build  (Read 30723 times)

Offline tel

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Re: Rotary table build
« Reply #30 on: October 22, 2012, 04:06:49 am »
30 turns? With a 60t wheel you should need 60 turns - one turn of the worm should advance the gear one tooth, or 6?.
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Offline Pete49

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Re: Rotary table build
« Reply #31 on: October 22, 2012, 05:37:25 am »
oh oh I thought something was wrong  :-[ Back to the drawing board we go....not a lot that should need sorting. The worm may be the culprit ...or my counting :old:
Pete
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Offline tel

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Re: Rotary table build
« Reply #32 on: October 22, 2012, 09:24:09 am »
Well, looking at your pic with the worm and wheels set up I can't see anything that would cause a gross error like that - perhaps you miscounted. Put a pair of alignment marks on with a felt tipped pen and try again. I know the wheel is 60t 'cos apart from being stamped '60' I did count the teeth.
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Bluechip

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Re: Rotary table build
« Reply #33 on: October 22, 2012, 09:36:06 am »
Can't really tell from the pic. but IIRC a 2-start  worm does that ... ie halves  the apparent reduction
 
Dave BC
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Offline tel

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Re: Rotary table build
« Reply #34 on: October 22, 2012, 10:05:55 am »
Yes, that would do it.
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Offline Pete49

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Re: Rotary table build
« Reply #35 on: October 22, 2012, 01:51:47 pm »
Just double checked this afternoon and it is 30 turns :-[. I have checked the worm and it and the other I have are both identical as Bluechip stated they are 2 start worm gears. I'll have a look at Ivans book on gears and see if I can get the head around it....Math was never my fave subject with the exception of algebra which I took to....pity about losing it if you don't use it
Pete
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Offline tel

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Re: Rotary table build
« Reply #36 on: October 23, 2012, 09:52:20 am »
No biggy, either go with the 30 turns, or cut a single start worm to get 60.
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Offline Pete49

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Re: Rotary table build
« Reply #37 on: October 23, 2012, 01:19:19 pm »
yes thats a solution Tel. Having read up on worm gears from Ivan Law's book and Arnodb's build I am going to attempt to make a worm gear. Worse case is it fails and I go with what I have but I reckon I can do it.
Pete
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Offline Pete49

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Re: Rotary table build
« Reply #38 on: October 25, 2012, 02:11:15 pm »
Well a successful day in he shed.  ;D I shaped a piece of HSS to what I gathered was the right shape and st the lathe to cut 8tpi and wow it worked I have a worm gear ....my very first one that I cut. Now the table turns 1 full turn for 60 times of the crankdial...the next job on the list is to make a marker so I can mark the dial & table. Stay tuned for the next episode
Pete
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Offline zeeprogrammer

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Re: Rotary table build
« Reply #39 on: October 25, 2012, 11:16:49 pm »
Good going Pete. Sure wish there was a pic or two.  :'(
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Offline tel

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Re: Rotary table build
« Reply #40 on: October 25, 2012, 11:33:00 pm »
ONYA Pete! The hardest part about it is convincing yourself you can do it!
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Offline Pete49

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Re: Rotary table build
« Reply #41 on: October 26, 2012, 03:44:35 am »
Yep that was the biggest hold up Tel but now I know I can and threading on the lathe is no longer a dark art for me :cartwheel: I know its a slow build compared to most here but It will be done when its done.
Carl pics are being organised now  ;D
Pete
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Offline Maryak

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Re: Rotary table build
« Reply #42 on: October 26, 2012, 07:35:46 am »
And...............wait for it...............an ONYA from me as well  :praise2:

Best Regards
Bob
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Online Jo

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Re: Rotary table build
« Reply #43 on: October 26, 2012, 08:20:00 am »
Well done :NotWorthy: First bit of threading a worm gear, talk about jumping in the deep end.

Jo
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Online steamer

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Re: Rotary table build
« Reply #44 on: October 26, 2012, 11:39:20 am »
Wot Bob and Jo said!    Pictures please! ;D


Dave
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