Rotary project, maybe????

[Rickabilly]

(09-13-2012, 08:06 PM)claudef Wrote: Now you have given me many Iterations of how I should graduate my dial and vernier and would like to consider these before I get to scribing but for the life of me I can’t follow what you are saying in words..

Always the problem

I will get to work on a sketch, the trick is that there is always one more graduation on the same length of actual dial as compared to the vernier scale. The other "trick" on this project is the mental jump beyond the base 6 of the dial increments, as the actual size of the increments is less important than the relative scale of the increments, the magic number here is 110%.

Each of the increments on the vernier scale need to be 110% of the length of the increments on the hand wheel. And you need ten of them. so standby for the image.


  Vernier scale.docx (Size: 37.55 KB / Downloads: 13)

   

I'm 99% positive on this, it feels right, but the usual disclaimer applies, Check it yourself first and be satisfied before cutting metal, incidentally it's the positive and negative directions that are likely to be an issue as these are always a bit confusing, so I'd do a trial assembly and test before marking these.

Best Regards
Rick

[claudef]

  220px-Worm_Gear.gif (Size: 226.06 KB / Downloads: 131) Rick… Thanks for the quick reply with the picture.
It clarifies the words I was not understanding.
My worm has a RH pitch and the RT is graduated for CW rotation so the final dial movements in dialing in an angle will always be in the CW direction. This negates the vernier scale on both sides of the Zero.
Your dial picture shows for a CCW rotation, otherwise it’s the same.
I was going to put the 10th line on the vernier scale but it’s redundant, no one will ever looks for it. There might be some benefits to it so I will include it when I am scribing.
Thanks again for the feedback… Claude

[Rickabilly]

No problem Claude,
The tenth line is valuable, if for no other reason, than it confirming that your method of indexing has been accurate as the first and tenth vernier scale marks will need to line up exactly in line with the first and eleventh dial graduations for any of the measurements to be accurate.

And I would probably leave off one of the negative or positive scales as well in practice if I was making it but if I was specifying it to be made for a customer it would be present, that is the only reason I added it to the drawing.

In fact I did leave it off the first drawing that was lost in a bad file transfer When I drew it the second time I just thought why not.

Regards
Rick

[claudef]

Have not posted for a while but did progress the project somewhat.
I milled the clamp slots in two sides of the base which is near finished and took a picture of the chamfer machining with a one inch counter sink. I then started machining parts for the dial assembly. This is what I got done thus far.

[EdK]

Claudef,

Thanks for showing how you did the chamfer. Much simpler than I envisioned.

Ed

[DaveH]

Very nice Claude

DaveH

[Rickabilly]

Looking good Claude

[ETC57]

Very cool Claude,

Jerry.

[claudef]

Here we go... 6" rotary table project on the home stretch..
Now I need to make a handle for the turn dial and then graduate the dial. After that I guess I might make a box for it, who knows when I will ever get to use this?
Claude

[Rickabilly]

Nice!!!