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21st March 2014, 04:30 PM #1
Indexing Dividing Super Spacer what's the essential difference?
This weeks question in the ever growing category of misused confusing terms...
What's the difference between a "dividing head" an "indexing head" a "super spacer", let's throw in "spin indexer" as well, just to help muddy the waters?
Ray
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21st March 2014 04:30 PM # ADSGoogle Adsense Advertisement
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21st March 2014, 04:50 PM #2
Hi Ray,
I would have thought dividing head and indexing head were the same. Super spacer is a new one for me. Anything I have looked at with the term spin in its name is generally free to turn and has no worm drive. It could have a detent plate though so simple indexing could be done.
Doesn't really help does it.
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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21st March 2014, 04:55 PM #3
I think dividing head and indexing head are the same animal and can divide down into part of a degree, while a spin indexer is only does fixed degrees. Don't know a bout a super spacer, though.
Never mind, someone will come along who knows this and more.
Grahame
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21st March 2014, 05:09 PM #4Pink 10EE owner
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Super Spacers are essentially one of those Horizontal/Vertical rotary tables with a very large spindle bore.... They also have index plates for simple indexing..
Light red, the colour of choice for the discerning man.
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21st March 2014, 06:14 PM #5.
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How about...a dividing head (non optical) utilises division plates driving the spindle by means of a worm and worm wheel to divide a circle. An indexing head divides a circle via the direct indexing of a spindle mounted plate. Most dividing heads have a provision for direct indexing but indexing heads being simpler devices, often don't readily facilitate the installation of a wormwheel, worm, sector arms, plates etc.
BTLast edited by Anorak Bob; 21st March 2014 at 06:25 PM. Reason: slipped in" often" because I have one that does.
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21st March 2014, 08:10 PM #6
Not an area of expertise for me, but one of general interest. My understanding follows Anorak Bob's, not familiar with the other couple of names though.
I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
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21st March 2014, 09:02 PM #7SENIOR MEMBER
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Super spacer
I have one that is actually the best Gray's pickup I have acquired. The picture only showed the chuck and was advertised as such. Repco badged but not the Repco chain that is around now, made in Melbourne Bayswater, I now have 2 Melbourne bits of kit, this and Shaper that were made when engeneering gear was made to a high standard.
They basically have interchangeable discs with different notches to provide set indexing, very quick and sturdy. Shame I don't have the mill to use it on.
Might need to move it on.
Cheers
Bruce
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21st March 2014, 09:05 PM #8
I think I get what you are saying, the dividing head has division plates attached to the worm input worm drive. Part of the confusion I think is that most dividing heads also have an indexing plate. (that's the one attached to the spindle? )
So, is this correct?
Dividing head
Dividing Head with indexing plate?
The super spacer, is I think a mostly American term, I think it's usually a notched indexing wheel attached to the spindle. Some times with pneumatic or lever operated indexing, pull the lever and it rotates a preset number of degrees, not as accurate as a dividing head.
Super Spacer https://www.huronindustrial.com/biso...ng-plates-5902
Spin Indexer, no gear drive, just spins.
Ray
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21st March 2014, 09:16 PM #9
Just to add another level of complexity....
In the Brown and sharp d/h book they call indexing on the spindle direct indexing, on the worm indirect indexing and using indirect indexing but with a gear train to slip the indexing plate differential indexing. The last one is for doing things like prime numbers.
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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21st March 2014, 09:32 PM #10.
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Here's a bit about the spin indexer that may be of interest - http://www.thegaragegazette.com/index.php?topic=109.0
Further reading has suggested that spin indexers are fairly lightweight bits of gear. Most of the readily available versions accommodate 5C collets which means there's another set of collets to purchase.
Some spin indexers are cheaper than chips - http://www.ebay.com/itm/5C-Precision...item54067d2c45 and some less so - http://www.ebay.com/itm/Suburban-Too...item3a8d462272
Having the indexing plate so close to the spindle nose would give me the sh.ts. For short workpieces, and without tailstock support you could only really work on short stuff, it would be bloody hard to get a chuck and cutter in close enough to do any good. A grinding wheel might be another story.
BT
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21st March 2014, 09:43 PM #11Philomath in training
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I think they are cheap to copy, but Yuasa who do some very nice kit (my R/T and large D/H are both theirs) so there are some better ones out there. The problem is as you say the 5C collets. I quite liked Bruce's indexing chuck mount so I'd probably take something like that over a spin indexer. I have a small Ellis dividing head that I have to make up some index plates for that was going to be my simple indexing device.
Michael
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21st March 2014, 09:53 PM #12GOLD MEMBER
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21st March 2014, 09:57 PM #13Philomath in training
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21st March 2014, 10:02 PM #14GOLD MEMBER
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21st March 2014, 10:57 PM #15
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