Author Topic: Coax Indicator, designed by W.K.Todd  (Read 3703 times)

Offline Art K

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Re: Coax Indicator, designed by W.K.Todd
« Reply #15 on: December 13, 2018, 02:40:11 AM »
I have one that I bought at the NAMES show and then didn't use for a few years. Set it up fairly close to center in a hole flip on the spindle and dial in the table til its centered, done. I bought it from little machine shop & use it at work a lot now.
Art
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Offline fumopuc

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Re: Coax Indicator, designed by W.K.Todd
« Reply #16 on: December 14, 2018, 12:38:53 PM »
Hi everybody,
here a picture of the standard low cost indicator and the version Bill has designed.
This big difference is the reason why I have started the build.
If someone is interested, here a video of making the rocker with Fusion360 CAM and my mini CNC mill.
Kind Regards
Achim

Offline b.lindsey

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Re: Coax Indicator, designed by W.K.Todd
« Reply #17 on: December 14, 2018, 02:48:28 PM »
Nice video Achim and that picture really shows the reduction in headroom required!!

Bill

Offline fumopuc

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Re: Coax Indicator, designed by W.K.Todd
« Reply #18 on: December 15, 2018, 07:51:32 PM »
Looks good,

 It's really a buzz to see someone making something I designed  :pinkelephant:

Were the drawing ok, were you able to follow my description?

Bill

P.s the pdf is on my google drive here:

https://drive.google.com/file/d/0BwXDcXKx2KzlaUVrZ0l6QU4yaTA/view?usp=drivesdk


Hi Bill,
Is there any type of spring between the bearing at the top and the housing ?

Kind Regards
Achim

Offline crueby

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Re: Coax Indicator, designed by W.K.Todd
« Reply #19 on: December 15, 2018, 08:18:33 PM »
And if I am interpreting the drawings correctly, the tip of the dial indicator is pushed back by that 45 degree taper on the center shaft, as the shaft is pulled by? Any chance you could do a cross-section view of the assembled unit in the 3D model? Its tough to visualize how it all comes together.
Thanks!Chris

Offline fumopuc

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Re: Coax Indicator, designed by W.K.Todd
« Reply #20 on: December 15, 2018, 08:40:50 PM »
.. that was easy. :Lol:
The housing will be lifted.
« Last Edit: December 15, 2018, 08:44:40 PM by fumopuc »
Kind Regards
Achim

Offline crueby

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Re: Coax Indicator, designed by W.K.Todd
« Reply #21 on: December 15, 2018, 08:48:08 PM »
That helps a lot - thanks!!!

Offline Steamer5

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Re: Coax Indicator, designed by W.K.Todd
« Reply #22 on: December 15, 2018, 09:26:57 PM »
And hereís me thinking my list is looking like itís going to get shorter!

Looking good Achim. And thanks to Bill for coming up with a neat design

Cheers Kerrin
Get excited and make something!

Offline BillTodd

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Re: Coax Indicator, designed by W.K.Todd
« Reply #23 on: December 16, 2018, 06:59:19 AM »
Looks good,

 It's really a buzz to see someone making something I designed  :pinkelephant:

Were the drawing ok, were you able to follow my description?

Bill

P.s the pdf is on my google drive here:

https://drive.google.com/file/d/0BwXDcXKx2KzlaUVrZ0l6QU4yaTA/view?usp=drivesdk


Hi Bill,
Is there any type of spring between the bearing at the top and the housing ?

Yes, it should be just strong enough to push the body back when horizontal, but not too strong.

The spring should be the same diameter as the bearing so that it pushes on the outer race , the bearing stops the spring being wound up as the spindle turns
« Last Edit: December 16, 2018, 07:07:06 AM by BillTodd »
Bill
wy omnibus Latinis taurus stercore?

Offline fumopuc

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Re: Coax Indicator, designed by W.K.Todd
« Reply #24 on: December 16, 2018, 07:38:26 AM »
Looks good,

 It's really a buzz to see someone making something I designed  :pinkelephant:

Were the drawing ok, were you able to follow my description?

Bill

P.s the pdf is on my google drive here:

https://drive.google.com/file/d/0BwXDcXKx2KzlaUVrZ0l6QU4yaTA/view?usp=drivesdk


Hi Bill,
Is there any type of spring between the bearing at the top and the housing ?

Yes, it should be just strong enough to push the body back when horizontal, but not too strong.

The spring should be the same diameter as the bearing so that it pushes on the outer race , the bearing stops the spring being wound up as the spindle turns


Hi Bill
somethings like this is available of the shelf in SS, outer diameter is 21 mm and wire is 1 mm.
I will order one.
« Last Edit: December 16, 2018, 07:42:36 AM by fumopuc »
Kind Regards
Achim

Offline fumopuc

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Re: Coax Indicator, designed by W.K.Todd
« Reply #25 on: December 16, 2018, 05:18:39 PM »
A little step forwards.
Kind Regards
Achim

Offline Dave Otto

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Re: Coax Indicator, designed by W.K.Todd
« Reply #26 on: December 16, 2018, 05:21:10 PM »
That looks great Achim!

Dave

Offline b.lindsey

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Re: Coax Indicator, designed by W.K.Todd
« Reply #27 on: December 16, 2018, 05:35:04 PM »
You are making fast progress Achim!! Looks great so far too.

Bill

Offline fumopuc

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Re: Coax Indicator, designed by W.K.Todd
« Reply #28 on: December 17, 2018, 01:07:19 PM »
Steamer5, Bill, Dave, Bill, Thank you.


I have got it nearly.
I do have a basic run out of 0,05 mm, which, I think, is caused by my laziness.
I did not follow Bills advice to turn the shaft in one piece between centers.
My shaft is made by  a 15 mm silver steel bar of the shelf.
At the turning operation, I could already measure a run out of 0,04 mm, which is now still visible plus some additional tolerances.
I will make the probe holder now and will see if I can work with this basic run out.
« Last Edit: December 17, 2018, 05:39:02 PM by fumopuc »
Kind Regards
Achim

Offline BillTodd

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Re: Coax Indicator, designed by W.K.Todd
« Reply #29 on: December 17, 2018, 06:45:32 PM »
that runout may be caused by surface roughness, (grabbing the slider part)  Try polishing the 45į section of the shaft
Bill
wy omnibus Latinis taurus stercore?