Chronos gear making DVD

Has anyone seen the Chronos gear making DVD and is it any good?
http://tinyurl.com/ypcdom
AWEM

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On Sun, 30 Sep 2007 09:48:19 +0100, "Andrew Mawson"

It's crap, in fact it's worse than crap it's crap, crap.
Not worth the plastic it's written on.
Reasons:-
In no order,
[1] Out of focus.
[2] Crap.
[3] 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.
[4] Crap.
[5] Boring.
[6] Crap.
[7] Uses the wrong value of Pi in all the calculations so every calculation is out.
[8] Crap.
[9] 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 place
[10] Every shot of a finished gear is that bad you can't see whether it's correct, good bad or crap - suspect crap.
[11] 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 work.
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.
[12] 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.
[13] He's clueless.
[14] Crap.
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wrote:

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.
Keith
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On Sun, 30 Sep 2007 09:49:09 GMT, John Stevenson

Don't hold back John <vbg>
Is this from that Jose Rodriguez chap, whom I seem to recall you've mentioned before in a similar vein?
Peter
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On Sun, 30 Sep 2007 10:59:05 +0100, Peter Neill

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.............
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Much crap snipped:-)
Do I get the feeling you didn't think much of it?
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On Sun, 30 Sep 2007 09:48:19 +0100, "Andrew Mawson"
No idea but for simple gear making why not :-

http://uk.youtube.com/watch?v=A_vkEisUo9k


http://uk.youtube.com/watch?v=yKiJB5lJizw


http://uk.youtube.com/watch?v=NOdiXk3mM0I

:-)
--
Peter Parry.
http://www.wpp.ltd.uk/
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Peter Parry wrote:

Why the hell did they call it "Simplex"!?
Nick
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wrote:

"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 _really_ complicated.
--
Peter Parry.
http://www.wpp.ltd.uk/
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Peter Parry wrote:

So simplex stands for:
Satanic Incarnation of Meshing gears Pulleys Levers EXcenters
Nick
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wrote:

Simply Incredible Machine Probably Lunatic Engineers Xylophone
--
Peter Parry.
http://www.wpp.ltd.uk/
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Peter Parry wrote:

Severely Insane Mechanics. Producers Like Extreme xerasia
Nick
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Peter Parry wrote:

IIRC those vids were part of the owners efforts to sell the gear making machine on Ebay.
Great work on his part.
Don't recall what the machine sold for, though.
Cheers Trevor Jones
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Or this afternoon's efforts:-

http://www.youtube.com/watch?v
RlGffXM5k
:-)
Mark Rand RTFM
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Try the following links to see one mans tutorial on gear cutting. Yours in the workshop John

http://uk.youtube.com/watch?v=MItgd-faHFw


http://uk.youtube.com/watch?v=vQGAK06JLQg


http://uk.youtube.com/watch?v=rBMRJ_K14IA


http://uk.youtube.com/watch?v~TcZLJrWXE


http://uk.youtube.com/watch?vbymeJ0l9VM


http://uk.youtube.com/watch?v=bpS5ZDOBV14


http://uk.youtube.com/watch?v=5g5dF28w5eM

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wrote:

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.
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John Stevenson wrote:

> Diametrical pitch?
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a
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 Gear Planer.
AWEM
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On Sun, 30 Sep 2007 23:59:38 GMT, John Stevenson

Had me puzzled too....
Regards, Tony
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hinkela2 wrote:

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.
Nick
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