Jakobs Gear Hobber from scrap (no casting)

celsoari · Nov 18, 2024

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 · Nov 20, 2024

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 · Nov 21, 2024

timo_gross said:
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 · Nov 22, 2024

celsoari said:
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

Richard Hed · Nov 22, 2024

timo_gross said:
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.
View attachment 161395

Greetings Timo

Loved the comedy vid. I used to be very interested in electronics. I know that if one takes the time to learn how basic things like resistors, capacitors, tubes (valves in British), transistors, and most of all transformers, how they work, then learn how to read schematics, then you are 90% of the way to being able to use them for your projects. And learning how these things work is not that difficult. I am not speaking of the way things are taught in schools all with math, rather, knowing the functions and what it does. After that, it's as simple as follow a cake recipe. Really!

ajoeiam · Nov 23, 2024

timo_gross said:
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.
View attachment 161395

Greetings Timo