Jakobs Gear Hobber from scrap (no casting)

[celsoari]

Recently I decided to build a machine to manufacture gears, in this video and in the next ones I will show the progress of the construction. I hope you like it. More videos coming soon



Greetings from Brazil

Celso Ari

 

[timo_gross]

Very interesting.
What is the goal? ( I mean sizes of gears, types of workpieces etc. )

• using electronical gearing can help reducing mechanical complexity
• pure mechanical gearing has a certain fascination (is more fun to watch)

Are you already all the way through with the design? Tailstock support improves results quite a bit.

Someone who decided to go without any electronics, because .... he wants it like that.
This channel is full of good explanations and tips.



I went for a complete electronic approach. The gear axis has a ratio of 1:7 to increase torque a bit. The hob spindle is geared down 1:5 and runs at 600 rpm top speed.



Greetings Timo

 

[celsoari]

Very interesting.
What is the goal? ( I mean sizes of gears, types of workpieces etc. )

• using electronical gearing can help reducing mechanical complexity
• pure mechanical gearing has a certain fascination (is more fun to watch)

Are you already all the way through with the design? Tailstock support improves results quite a bit.

Someone who decided to go without any electronics, because .... he wants it like that.
This channel is full of good explanations and tips.



I went for a complete electronic approach. The gear axis has a ratio of 1:7 to increase torque a bit. The hob spindle is geared down 1:5 and runs at 600 rpm top speed.



Greetings Timo

Hi Timo,
I intend to make module 1.25 gears from 28 to 120 teeth.
I'm doing it in my spare time as a pure hobby. Certainly electronic devices make work easier. Unfortunately I don't know anything about electronics. I am a person from ancient times.
I'm sorry, my English isn't very good, here in Brazil we speak Portuguese, so sometimes it can be difficult to express ideas.
Celso Ari

 

[timo_gross]

Hi Timo,
I intend to make module 1.25 gears from 28 to 120 teeth.
I'm doing it in my spare time as a pure hobby. Certainly electronic devices make work easier. Unfortunately I don't know anything about electronics. I am a person from ancient times.
I'm sorry, my English isn't very good, here in Brazil we speak Portuguese, so sometimes it can be difficult to express ideas.
Celso Ari

You should not worry about your English, it seems to be just fine. A lot people here, me included, are non native English speakers.
If you do not know anything about Electronics it might be difficult to get it done, but an opportunity to learn something about it in the hobby process.


One easy method was shown in this video. The encoder is geared and the encoder pulse is fed directly to a stepper driver.

1.25 requires already some stiff machine and torque on the hob. 150 mm diameter is not very small .

Maybe one day I will build a hobbing machine too. I am now using a modified bench top mill, that is not ideal in some aspects. It works sort of, but cutting helical gears is not fun, because the hob angle affects the x-position of the hob by a large amount.


Greetings Timo