DIVIDING PLATE ..DIY ..Help...!!

minh-thanh · Oct 8, 2024

Hi All !
There are many ways to make dividing plate
Thanks for your comments and thanks for sharing !!

I just finished a dividing plate
A 40 and 35 hole plate
The 35 hole plate had 1 hole in the wrong position, I fixed it by pressing a small pin and re-drilling.
On the 40 and 35 plate there are 2 holes from which when changing the position between I can cut the 35 and 70 tooth gear
I will finish it and cut the gear and will inform the result

TSutrina · Oct 10, 2024

timo_gross said:
I think G-code would be the least to pose a problem. Hand coding the drill program should be straight forward enough.
There are lots of obstacles and challenges more serious than the G-code.

The goal is to put effectively a center punch equivalent into a steel disk. Then use a drill press and a centering sharpened drill or centering drill followed by a reamer. And I would make sure the motor is well mounted so the cut is repeated.

timo_gross · Oct 11, 2024

TSutrina said:
The goal is to put effectively a center punch equivalent into a steel disk. Then use a drill press and a centering sharpened drill or centering drill followed by a reamer. And I would make sure the motor is well mounted so the cut is repeated.

Yes, I assumed that. Drilling 4 or 6 mm plunger holes would possibly not work anyway.
Easy to overestimate the accuracy of those printers. Dividing a distance into a number of steps, does not automatically ensure the steps beeing equal.
In the example, PCB milling of a very simple single sided board, it is sufficient if features are somewhat in the right spot. For through hole components location errors of 0.1 mm will probably never cause any issue.
If a maximum deviation of +-0.1 mm is required over a distance of 150 or 200 mm it is an entire different story.

Even with a small drill quite some pressure is required to drill steel.
A good oportunity for the printer to help the drill to wander, cause deviations. (Worst case the Z-axis of the printer starts loosing steps)

Greetings Timo

minh-thanh · Oct 13, 2024

Hi All !
I tested cutting gear 35 , and also tested with the cutter that I sharpened
The final result ( 3 ) looks pretty good

timo_gross · Oct 13, 2024

minh-thanh said:
Hi All !
I tested cutting gear 35 , and also tested with the cutter that I sharpened
The final result ( 3 ) looks pretty good

View attachment 160167

You seem to make some progress.

I would be curious what you are doing. Is there another thread that I am missing? What angles did you experiment with?

minh-thanh · Oct 13, 2024

Hi @timo_gross
32 , 31.5 and 31 degrees
for this project of mine :

https://www.homemodelenginemachinist.com/threads/mastiff-lc-mason-engine-redo.35732/post-417901
And
https://www.homemodelenginemachinis...project-small-diesel-engine.35441/post-400737

TSutrina · Oct 15, 2024

timo_gross said:
Yes, I assumed that. Drilling 4 or 6 mm plunger holes would possibly not work anyway.
Easy to overestimate the accuracy of those printers. Dividing a distance into a number of steps, does not automatically ensure the steps beeing equal.
In the example, PCB milling of a very simple single sided board, it is sufficient if features are somewhat in the right spot. For through hole components location errors of 0.1 mm will probably never cause any issue.
If a maximum deviation of +-0.1 mm is required over a distance of 150 or 200 mm it is an entire different story.

Even with a small drill quite some pressure is required to drill steel.
A good oportunity for the printer to help the drill to wander, cause deviations. (Worst case the Z-axis of the printer starts loosing steps)

Greetings Timo

What is the accuracy of home 3D printers? - Quora

Answer: Generally, most modern consumer-grade 3D printers are capable of producing models with an accuracy of around 0.1mm to 0.2mm, which is sufficient for most hobbyist and prototyping purposes.

About steel. I wouldn't use a twist drill but a center drill with a totally different style point. Stiffness is an issue, and the drill tip configuration makes a big difference. Stiffness of the mount for the drill is something the person modifying his printer needs to consider. a belt drive for example over a chuck mounted to a toy DC brush motor would be my choice. or a bushing bearing(s) with the motor just providing torque. Depth of cut need only be what one would expect from a center punch. And a center punch could be use to deepen the one produced by the 3D printer.

TSutrina · Oct 15, 2024

timo_gross said:
Yes, I assumed that. Drilling 4 or 6 mm plunger holes would possibly not work anyway.
Easy to overestimate the accuracy of those printers. Dividing a distance into a number of steps, does not automatically ensure the steps beeing equal.
In the example, PCB milling of a very simple single sided board, it is sufficient if features are somewhat in the right spot. For through hole components location errors of 0.1 mm will probably never cause any issue.
If a maximum deviation of +-0.1 mm is required over a distance of 150 or 200 mm it is an entire different story.

Even with a small drill quite some pressure is required to drill steel.
A good oportunity for the printer to help the drill to wander, cause deviations. (Worst case the Z-axis of the printer starts loosing steps)

Greetings Timo

Don't like the drill idea that go with something you can do with a small gage solid copper wire taped to the printing head or better yet clipped to it. Then place the steel disk in a shallow tinfoil pan like for a pie. Obviously some centering feature such as a printed pin or pins.
Electro chemical etch with a small battery charger using salt water to carry the charge between the steel and the tip of the wire. (shaped with a file to be pointy). Since the divot as a center punch is the goal the tip of the wire can not touch the steel but be as close as you dare. The closer the less time and nicer shaped divot. You like do not even need to move the water. Cutting rate, current draw will decrease with the gap between the copper and the steel. The shape will favor an equal gap.

timo_gross · Oct 16, 2024

TSutrina said:
Don't like the drill idea that go with something you can do with a small gage solid copper wire taped to the printing head or better yet clipped to it. Then place the steel disk in a shallow tinfoil pan like for a pie. Obviously some centering feature such as a printed pin or pins.
Electro chemical etch with a small battery charger using salt water to carry the charge between the steel and the tip of the wire. (shaped with a file to be pointy). Since the divot as a center punch is the goal the tip of the wire can not touch the steel but be as close as you dare. The closer the less time and nicer shaped divot. You like do not even need to move the water. Cutting rate, current draw will decrease with

I think there is no point in trying to abuse a cheap stock 3d printer mechanic for any precision machining. (of any type). That is why I will not engage in these kind of experiments for sure.

( I admit I was foolish enough to try; in hindsight a total waste of time

(besides some lessons learned) )
I remain skeptical. If we both agree on the 0.1 mm positioning accuracy, then we are on the same page concering the positioning.
When on a shoe string budget 3d printer style electronics can be probably a good starting point.
It starts from 14$ with a cheap GRBL controller.

Greetings Timo

TSutrina · Oct 16, 2024

timo_gross said:
I think there is no point in trying to abuse a cheap stock 3d printer mechanic for any precision machining. (of any type). That is why I will not engage in these kind of experiments for sure.
( I admit I was foolish enough to try; in hindsight a total waste of time (besides some lessons learned) )
I remain skeptical. If we both agree on the 0.1 mm positioning accuracy, then we are on the same page concering the positioning.
When on a shoe string budget 3d printer style electronics can be probably a good starting point.
It starts from 14$ with a cheap GRBL controller.

Greetings Timo

One simple test if you have one plate already. Use the 3D printer to make a duplicate. We do know that holes are smaller because the plastic has some width and spreads out but if it is uniform around a hole then a drill will ream the hole to the correct dimension. This is a common practice. Dowel pins can be used to check actuary.

TSutrina · Oct 16, 2024

TSutrina said:
One simple test if you have one plate already. Use the 3D printer to make a duplicate. We do know that holes are smaller because the plastic has some width and spreads out but if it is uniform around a hole then a drill will ream the hole to the correct dimension. This is a common practice. Dowel pins can be used to check actuary.

The Greeks craftsmen created accurate patterns of holes with the simple use of a protractor. We have trigonometry calculators. Do you have a flat parking lot like a a church that isn't used for a few days. distance between two marks is twice the radius time the sine of half the angle. (180 / number) Calculator will provide a number. Now put the disk with a scribed circle at the center of the circle to be drawn on the surface and set a protractor to that distance. Complete a circle of protractor curves crossing the circle. Divide the error by the number of points. and adjust the protractor. Pick a new color and repeat. You can use a string pulled tight or a stick. So a 2 inch radius on the disk and a 3 ft radius increases the accuracy by 0.0555. A 3 yard radius by 0.0185, and a 6 yard radius by 0.00926. Bigger the better. So a mark on the pavement accuracy of 0.03 1/32 using a pencil protractor is possible. Drafting protractor would cut that in half. Same is true for the circle. The finer the circle the better. Rub out the marks on the pavement and start over with the next set of holes.

SmithDoor · Oct 17, 2024

minh-thanh said:
DIVIDING PLATE ..DIY ..Help...!!
I am finishing the gear cutting tool, it can cut spur gear and Helical gear
I am making a dividing plate to cut gears
The outer diameter is for cutting even numbered gears, the inner is for odd numbered gears
The outer diameter is relatively easy to divide by angle = 9 , but with the inner diameter, the angle of each part will be 9.23 degrees
The question is: How to divide accurately with an angle of 9.23 degrees ?
Do you have any suggestions ?
Thanks

View attachment 159952

The found was just buy set.
The next part is the chart.
It look at B&S diving head there chart for every hole devision to 250

Dave

DIVIDING PLATE ..DIY ..Help...!!

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