Thread: Qualos 00 gear hobber

I looked at that machine but decided that it was a bit small for what I did (although would probably do most) and was way too expensive (noted the crossed out tag). Well done. let me know if there are gears I can help with.

Michael

Originally Posted by Michael G

I looked at that machine but decided that it was a bit small for what I did (although would probably do most) and was way too expensive (noted the crossed out tag). Well done. let me know if there are gears I can help with.

Michael

Its a bit small for me too but i've got a couple of things i can use it for. The prices on the machines were high to deter people just bying them because they are cheap and competing with Hercus. In the current economic enviroment i can understand why they did that. When i talked the the bloke selling it and told him i wanted a hob just so i could learn how to use one he dropped the prices a fair bit for me. I was seriously thinking of buying the hercus Hobber but it was in pieces and didn't have any change gears so i bought the little Qualos hobber. He also tried really hard to sell me the big slash grinder but i just don't have the room.

Finally got it out the trailer and into the shed.
IMG_0497.jpgIMG_0501.jpg
I've measured up the change gears and they appear to be 24DP, I've just got to figure out the pressure angle now so i can try and source a hob. The change gears i have are 90,72,30 and 2 20tooth. with those gears and the ones i cut as i go i can cut another 7. I i use a compound gear train i think i can cut a few more also.
IMG_0504.jpgIMG_0505.jpg
Above are the photos of the collet that goes in the spindle, as can be seen in the photo its busted. It looks like a C type collet but it is too big for a C1 and too small for a C2. I think it might be some thing qualos made up. I'll keep searching for some collets to match but i think I'll have to make some and an arbor of some sort.

You can make your own hobs -
https://www.woodworkforums.com/showth...78#post1661078
Alright, it's being used to do a worm wheel there but the same applies.

Michael

Originally Posted by Michael G

You can make your own hobs -
https://www.woodworkforums.com/showth...78#post1661078
Alright, it's being used to do a worm wheel there but the same applies.

Michael

If all else fails I'll make my own hobs but I would rather buy them. Did you relieve the teeth on the hob? and if so how did you do it?
One of these would make it easy.
http://www.youtube.com/watch?v=pcOfChvoj40

I believe that when gashing the teeth on home made hobs the face of the tooth is at circumference height which gives relief to the tooth.

Ken

Originally Posted by snapatap

If all else fails I'll make my own hobs but I would rather buy them. Did you relieve the teeth on the hob?

It was only a small hob cutting into plastic, so no relief was used. When the real one comes back from holidays I was going to harden it and then do a little precision angle grinder work. However, now I have a surface grinder and so could set the hob up parallel to the mag table and do it that way - a little more repeatable.
This is an end view of the practice cutter I made up. OD= 36mm. I wanted to get a couple of teeth in the cut at once so it has 12 teeth per rev which is about as many as I could comfortably fit. By moving my relieving cutter across a little I also got some positive rake on the teeth. The end faces are not all that wide (bit under 4mm), so relief would not be a difficult thing to do with a pass or two of a grinder.

P1020370 (Medium).JPG

Michael