My Electronic Dividing Head

A test of my homemade electronic dividing head. Bearings and chuck is from the hardware store. Stepper, pulleys and timimg belt from an old scanner. Software is written in AVR Asm and running on an Atmel Mega48.
I made a spur gear, but the tooth profile is wrong. Anybody know of a program that can draw any spur gear with involute tooth profile?

Category:

Howto & Style

Tags:

• homemade
• electronic
• dividing
• head
• diy
• gear
• milling
• lathe
• atmel

[KapteinKUK]

The calculations is done in 16.16 binary, that is in 0.0000152 steps. Therefore the absolute error is non existent. However, there is a relative error per divition of -0.5 to 0.5 steps. The gearing gives 1200 steps per rotation, so this is no problem unless you go beyond about 200 divitions. In short, it works fine :-)

[berntd]

Hello I see.

@1200 steps per revolution gives us 0.3 degrees per step. That will cerainly be good enough for smaller gears and it will work fine:-)

However, for a gear of say 150mm diameter,the accuravy/error will be ~0.2mm.

I still think this has potential and I will investigate further to see if I can make one like it but with a bigger gear ratio.

Have you made any proper gears with it yet?

[KapteinKUK]

Yes, I have made several tooth belt gears, look in my video list.

I agree that more steps will be better. Give me a line if you make someting.

[danielpineda1289]

horrible way of cutting...

[fourxblz]

Nice set up. Any Insight on how to build one? Please!!!

[Seremis]

Excellent work. Just watching this makes me wanna spend some serious money on a mini lathe.

I don't see any mechanical locking devices in your design. I supose you keep the stepper coils energized to secure the position of the dividing head. Is that secure enough? Could you loose step count by accidentally turning the dividing head?

[lynnfredwoods1]

Hello

Very nice work. Do you have any plans for the electronics?

[salmiak911]

Är ett sådant kugghjul billigare än i handeln?

[futurepartyboy]

Bra jobba!

[drocketman2000]

As to your question about cutting a proper involute gear tooth profile, you have two choices. Either buy a gear cutter and replace your single tool bit with it, or use a pantograph to trace an involute curve and grind the curve into your tool bit. Possibly a third choice would be to use a wheel dresser to shape a grinding wheel into an involute form, and then grind your single point tool bit with it.

Randy

[tvicena]

very nice assessory good demo

[toolsriatgmaildotcom]

Love it - I was looking for a manual dividing head but this is better. Do you have any plans available to make my own? Thanks.