It's crap, in fact it's worse than crap it's crap, crap.
Not worth the plastic it's written on.
In no order,
 Out of focus.
 Using a home made mill from Taig and Sherline parts that hast the
tensile strength of pre stressed licorice so everything moves but not
all in the general direction.
 Uses the wrong value of Pi in all the calculations so every
calculation is out.
 Only works with TPI pitch hobs and never mentions DP or Mod so no
way to calculate for these even if he'd got Pi right in the first
 Every shot of a finished gear is that bad you can't see whether
it's correct, good bad or crap - suspect crap.
 Covers two types of hobbing, one with annular hob teeth where you
take a cut and it cuts one rack tooth and a couple of part teeth, you
then index round and repeat and the action of the part teeth leaves a
tooth with 3 flats on. Many use this method and it's passable for some
Second method is with a helical hob, or in his case a worm as he's on
TPI and using a pre gashed blank he free hobs it and relies on the hob
to drive the blank.
Due to backlash, movement etc this leaves a rough finish to the teeth.
 In the latter free hobbing method he tilts the blank and not the
hob so it will cut a wider tooth space than standard due to the
helical angle of the hob. No reason to do this as his Bassets Allsorts
machine can tilt.
 He's clueless.
Hmm, not your favourite DVD then John? or is it that Gert is still
giving you earache about all that extra flooring you had delivered?
Never mind think of all the machines you can store on 360 sq m.
Yes that's the one.
Don't know about any of his others as I only bought the gear hobbing
one and at about 30 quid I'd like to stop others wasting their money -
unless they want to buy mine if it hasn't been used instead of the RS
one as a coaster.............
"Awfully complicated set of clanging clattering and clicking rotors
cams belts and wheels" possibly doesn't have the same marketing
attraction? On the other hand the alternatives might have been
Interesting that 1 minute 40 into the first video he mentions making a
quick change gearbox for his CNC lathe ????????????
I thought the whole idea was on a CNC to do away with the gearbox ?
Besides this though watch these 6 video's because they show exactly
the same as Jose Rodriguez does but in more detail and better.
Yes, but that chap is quite wrong about how he thinks he's getting the right
profile (that he doesn't get).
With this kind of hob (it is not a spiral hob) he would have to make
different passes to get the profile. He thinks he gets it be feeding in in
small steps. Actually, he could feed the whole depth of cut and then will
have to make several passes.
These passed would look like this:
Make first cut. Rotate (to keep with his example) by a fraction of the angle
between teeth -say 2°- *and* lower the Z-axis "a bit" (math required) and
make a pass. Only this will give him a involute profile.
Now strictly speaking are those hobs? A conventional hob with a
helical track generates the gear by rotating the hob and blank
together. That form of 'hob' is really a rotating form of Sunderland
True it's not an involute but has a series of steps on it, the larger
the number of teeth the more the steps are due to interference with
the cutting teeth above.
In all fairness this type of gear is passable for the machinery it's
done on as even using a true spiral hob and gearing the blank will not
achieve a true involute due to machinery restrictions, flex, etc.
This is obvious in the video where he takes small 5 thou cuts. Nick
says cut in one pass but if you look and listen to the spindle those 5
thou passes are slowing it down.
This is bound to have an effect on finish and the true shape.
Moving the cutter up and down whilst rotating the blank will only
serve to cut a gear with more steps. A true involute can only be
produced by hobbing if it's generated, i.e. constant movement.
L Stevenson [ Engineers ]