Gingery method of marking dividing plates?

[Lee in Texas]

I'm trying to remember the method using graph paper to make a "tape" around the edge of a plate blank. I just can't remember how he did it. I have the book, but it's 200 miles away. I want to make a tape with 7 divisions and attach it to my Sherline rotary table. I'll just lock it at each mark to help with a model radial engine. (non-functional).

[topct]

Wrap a piece of masking tape around the outside of the table.

Slice through where the ends overlap.

Peel it off and measure how long it is.

Divide that length by 7, and with a caliper you could mark the tape.

Stick it back on the table and have at it.

Actually I might use a piece of paper instead of masking tape. Masking tape stretches.

[LES A W HARRIS]

Lee,

Have not read the method; I was taught this long ago.

Select even multiple larger than Pi * D, swing arc run vertical from last point to intersect arc. Line from origin to intersect it, in example 4.00 dia, then use 14" arc, this divides every two inches, seven divisions, vertical lines down to intersect.

Cheers,

[Mike Burdick]

I don' know if this is what you're referring to but here is a description of graphical division...

1. Draw a horizontal line the length of the circumference - call the endpoints of it A and B.
2. Draw another line from point A that is 7 units long (use a scale or dividers) at any angle - call its endpoints A and C. Make tic marks at the units.
3. Draw a line from point C to point B.
4. Now draw parallel lines to CB and locate them at the tics.
Line AB will now be divided equally into 7 segments.


Note: the units along AC can be anything you want as long as they are the same length. Basically what is happening is that the unit’s length is being projected on to the line to be divided which is line AB.

[texas_po_boy]

I have to say it never fails to amaze me how intelligent this group is on just about any subject. A school in its self. I was once told that anything was easy if you knew how to do it.

[lane]

I have to say it never fails to amaze me how intelligent this group is on just about any subject. A school in its self. I was once told that anything was easy if you knew how to do it.

IT is not in how to do it .But who to ask.

[Lee in Texas]

Les-
That's what I was looking for. Gingery showed how to do it with pencil and paper. It will certainly work well enough for a non-working display model.

Thanks, Lee

[Magic9r]

Gingery Method?
That'd be the long slow way justifiable by having no immediate need to make a component and having nothing better to do and not wanting a machine that's likely to last would it?

Regards,
Nick

[Lee in Texas]

Gingery Method?
That'd be the long slow way justifiable by having no immediate need to make a component and having nothing better to do and not wanting a machine that's likely to last would it?

Regards,
Nick

I have all of his books except the one on the drill press. As others have said, at the time they were written, used machines were hard to find and expensive. At the time, they made more sense. They make interesting reading.

For someone who wants to get into machining as a hobby, they are really nice to have. I'm a plumber and I'm not going to be a machinist by trade. Plumbing is just too stable. I tried getting hired on as an apprentice machinist, just so I could learn something. No luck there. I tried taking a class, but in Austin, the one class available couldn't get the minimum of 10 students. The nearest class is 90 miles away. That's a no-go. So for me, they're neat little books. (I bought a Soouth Bend and a Bridgeport, so I will not be making machines with a flimsy machine...that I made ) I'll be ordering some videos when finances get better (I'm an apprentice plumber for another few months)

[lazlo]

Hey Lee, are you also in Austin? You should come by sometime and I'll give you a shop tour (Burke Knee Mill, Clausing 5914 lathe, Brown & Sharpe No. 5 Tool & Cutter Grinder).

Shoot me a PM and you can come over and share a couple of cold ones...