Dividing a circle by 359

[vtcnc]

The link did not work

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@Smithdoor - I reported my post to the staff. I can see the links fine on a desktop web browser (Chrome). However, I cannot view the media on my iPhone using Tapatalk. I think Tapatalk may be the problem.

Anybody else have problems seeing the media files?

 

[HMF]

Tapatalk may be the issue- it is pretty unstable.

Can these be uploaded to our own video library?

 

[brino]

Anybody else have problems seeing the media files?

It looks great from here. (win7 PC and firefox browser)
That is one cool machine!

-brino

 

[stuartw]

wow.. impressive laser setup and the cur disc looks great!! I pm'd you my address.

 

[vtcnc]

Tapatalk may be the issue- it is pretty unstable.

Can these be uploaded to our own video library?

I uploaded the photo to our library. The video was too large - I received an error stating that. YouTube was the path of least resistance for the video.


Sent from my iPhone using Tapatalk

 

[vtcnc]

It is pretty hard to describe how many ways that machine has helped us and our customers - with little to zero downside. This is the unit we have had for about 4 years now...

One thing to consider is that Stuart's dividing head was programmed in about 5 minutes. It took me longer to walk down to the laser and talk to the operator about running it. The run time was a little over 6 minutes. Imagine being able to prototype parts out of scrap sheets that quickly...

Trumpf 2030 Fiber Laser

 

[Canuck75]

Late to the party but Brown & Sharpe calls this requirement "Differential Indexing" in which the appropriate indexing plate is moved by gearing at the same time the indexing handle is turned. Apparently any number of divisions is possible. The reference I have is an old "Burghardt & Axelrod Machine Tool Operation" book, circa 1954.

Cheers

 

[benmychree]

Late to the party but Brown & Sharpe calls this requirement "Differential Indexing" in which the appropriate indexing plate is moved by gearing at the same time the indexing handle is turned. Apparently any number of divisions is possible. The reference I have is an old "Burghardt & Axelrod Machine Tool Operation" book, circa 1954.

Cheers

Actually, the Brown & Sharpe dividing head will index 359 divisions without resorting to differential indexing; their book "Practical Treatise on Milling and Milling machines" lists 359 divisions as being 5 holes on a 43 hole plate; Cincinnati does not list 359 divisions on their tables, but being as they have a 43 hole plate listed, it would also be possible on their dividing head, or any other 40:1 dividing head with a 43 hole plate.
I have done differential indexing on my B&S dividing head, notably for 127 tooth gears for metric transposing; the usual candidates for differential indexing are prime numbers, which 127 is.

 

[brino]

Actually, the Brown & Sharpe dividing head will index 359 divisions without resorting to differential indexing; their book "Practical Treatise on Milling and Milling machines" lists 359 divisions as being 5 holes on a 43 hole plate

Hi John, I started playing with the math to see for myself how that'd work.......but I don't think it does.......

A 40:1 worm will give 360/40 = 9 degrees per full revolution.
To divide a circle by 359 means that each of the 359 steps has to be: 360/359 = 1.002785515 degrees apart.
5/43 * 9 degrees = 1.046511628
Dividing a circle by 1.046511628 gives 344 divisions.

However, I did find a copy of that Brown and Sharpe book in my library.
At the top of the table it shows:

then for the 359 line this:

So four gears mounted in the chain for differential indexing.
However, I have NOT worked out the math on that one....

-brino

Oh, I also see in their table for 344 divisions they use plain indexing and 5 holes on the 43 plate:

 

[benmychree]

I stand corrected; the dividing for 359 does require differential indexing; I did not look far enough to the right on the page to see the change gears; MY BAD! "The book" was one of my apprenticeship textbooks; it has the front cover missing now, but the contents are intact, so no excuses, except old age and lack of attention!