Jacobs Gear Hobber

Some moons ago I wrote a challenge to the Editor on a similar topic. I what it said was that if you could read the rotational speed and (position) of a shaft (say of my milling machine) and factor this into a stepper motor which could then drive a shaft with a gear blank on it. Behold you have a gear hobbing machine.  The problem for me my ‘electronic’ stopped with the introduction of the pentode valve. Any one out there want to design the black box to do it?

The advantage of hobbing is that you only need one hob for each Module/Diameteral pitch and that is cut as Rack’. With gear cutting you need several cutters for each Module/Diameteral pitch depending on the number of teeth you are cutting.

Hello John,

Thanks for that reference. Although I have been subscribing to MEWS since 2004 here in Hungary (and before that in the U.K.) MEWS No 108 is missing.

This would have been about October 2005. In 2004-5 the publishers of ME/MEWS were using a Swiss distribution company for the Euro Post. Summertime distribution in 2004 was bad –well there were holidays, so they would be short handed and the batch for Hungary was very small! It was forgotten –dimmed-. The same thing happened in 2005. 

Later in 2005 the distribution company was involved with a nasty swindle involving an Italian outfit. The Swiss authorities just cancelled the distributor’s licence and dumped on them from a great height. They should be ‘out’ in a few years time (with good behaviour). The Swiss are very strict.

I cannot get a copy of MEWS No 108 as there are none left. The Swiss just shredded the blooming lot and the publishers had to use up their surplus to satisfy demand.  

That is why I did not know about this article. 

If any one could scan in and message me a copy of the article I would be delighted.

HOME MADE GEAR HOBBER (BIG HEAVY DUTY)

I am looking for complete plan(casting drawing, machining etc.) to make home made GEAR HOBBER (swing 175", Module 45, Face 48", Can hold weight up to 40 Ton). I really appreciated if Some one help me. Ejaz.

(Please send Ejaz a PM. Ed.)

Edited By Diane Carney on 11/03/2013 10:27:26

Can someone please help with some instructions on how to the determine gears needed to cut spesific counts of teeth in the CES Jacobs type gear hobber?

Joey

John S. - I have just fished out MEW 108 and the gear hobbing system looks very interesting, I must have flicked past it at the time without thinking too much about it.

I am interested in trying it out and was wondering if the layout for the PCB you mentioned is available, since I don't like veroboard. I could do my own layout but it would save me a lot of time if one was already available.

Doug

Doug,

I do have some pictures and PM sent.

I visited CES several weeks ago. I expressed intedt in the hobber, apparently it is quite a popular projecty. They are quite happy to supply part-sets of castings as the machine has parts which potentially have several other applications, not least a vertical slide.

Neil

Note that the design appears to have been updated by an American. 'simplified and improved' to make it more ridgid. However his kit is rather expensinve and only available in USA.

Getting interested in the electronic version and of course the relevent MEW has decided to hide itself somewhere, probably in a pile of MEs.

Doug, I have done the pc board for the electronic synchroniser for the gear hobber on my Mach 3 controlled Optimum mill. if you are interested and can use it, I can mail you the G-code and Autocad 14 drawing or dxf files. I am trying to fit the unit to a Jacobs type hobber and it should then run without the use of lots of gears.

Joey