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Thread: Vacuum Chucks
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27th April 2014, 07:43 PM #46Originally Posted by Eva369
I don, t believe for one minute you are thick......
I have a KISS approach ,,, keep...it ..simple...stupid
and it could not be simpler..!!!!!!!,
as some one has already added a link have a
look and you will see what I mean..
You can get an Insert adapter to suit your threadCheers smiife
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27th April 2014 07:43 PM # ADSGoogle Adsense Advertisement
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27th April 2014, 08:08 PM #47
thanks, I'll check that out now .... what is the advantage of this system over a vacuum pump ... I have not priced a vacuum pump - maybe they cost more than I thought.
This is one of those things I thought it would be nice to get eventually
Dave the turning cowboy
turning wood into art
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28th April 2014, 01:00 AM #48
Dave, the main advantage to the HoldFast vacuum generator seems to be ease of setup.
A vacuum pump costs $100, a vacuum gauge about $20 delivered, a lever ball valve for vacuum release/adjustment $10-$20, a double-sealed bearing <$5, an air filter $11, then hose and fittings, plus some turning for the vacuum cup(s) and handwheel fitting.
A link to the pump I bought: http://www.ebay.com.au/itm/Electric-...#ht_4004wt_996
There's still 3 left at this price - all others are dearer.
A link to the air filter as used in TTIT's setup: http://www.ebay.com.au/itm/NEW-Auto-...#ht_1671wt_926
" " " a gauge: http://www.ebay.com.au/itm/Vacuum-Ga...item19df72f2f3
This (UK) supplier, (where the gauge comes from), has heaps of fittings, hose, etc.: http://www.ebay.com.au/sch/context-p...p2047675.l2562
(You might be able to find this stuff locally - I was lucky and a mate in Sydney is giving me most of what I need.)
If you read back through the last couple of pages you'll find a bit more info.
Also, I've attached a pdf originally provided by Cliff earlier in the thread that provides some more useful info on building one. It's worth saving a copy of this, if you go the DIY route.... Steve
-- Monkey see, monkey do --
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28th April 2014, 08:24 PM #49
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28th April 2014, 08:49 PM #50
Sorry if I stepped on your toes, Michael, but after doing all that hunting for sources of the various bits, I wanted to share the knowledge.
Regarding a compressor for running the vacuum generator, apparently it needs to be a decent size to maintain enough constant pressure, too, according to that 'Vacuum Chuck Demo' pdf.
(Definitely not my little old beast.)... Steve
-- Monkey see, monkey do --
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28th April 2014, 09:08 PM #51
QUOtE=Hermit;1769667]Sorry if I stepped on your toes, Michael, but after doing all that hunting for sources of the various bits, I wanted to share the knowledge.
Regarding a compressor for running the vacuum generator, apparently it needs to be a decent size to maintain enough constant pressure, too, according to that 'Vacuum Chuck Demo' pdf.
(Definitely not my little old beast.)[/QUOTE]
Hi hermit
No toes hurt here mate
All INfo gathered helps everone interested
and also sharing our knowledge with each other
Is what this forum Is all about isn, t it ?
I think the compressor capacity needs to be at least 60psiCheers smiife
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28th April 2014, 09:18 PM #52
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28th April 2014, 09:27 PM #53
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28th April 2014, 10:23 PM #54Senior Member
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I had toyed with the idea of vacuum chucking for some time before coming up with the following.
The handwheel on my Nova lathe will fit a standard size bearing. There is already a threaded hole to secure it in place with a grub screw.
Image00001.jpg
I made up a wooden adapter to fit the end of a vacuum cleaner hose and a snug fit to the inside of the ball bearing.
Image00004.jpg
The spindle is free to turn while the hose remains stationary. Just in case it gets knocked out, I usually tape it to a support. The vacuum cleaner hose has a sliding "bleeder" valve which I leave slightly open to prevent the vacuum cleaner from overheating.
Image00002.jpg
I bought a "Beall" spindle tap to suit my lathe and made up a number of different sized chucks with a circular rebate to which I glued some closed cell rubber piping. Works a treat! No need to worry about sucking in some dust - that's what the vacuum cleaner was made for.
Image00003.jpg
Total Cost
Bearing - about $2
Rubber - about $5
Beall Spindle tap - $28 (+$10 postage from US)
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28th April 2014, 10:32 PM #55
My original thought was to simply use a vacuum cleaner, but everyone and everything I read told me that it would burn the motor out due to insufficient air flow, even with the bleeder open.
You might have struck it lucky with a vacuum cleaner that can handle it.
What's it like for extra-thin-walled bowls? No crushing?
And no UFO's when turning a tenon off the bottom?... Steve
-- Monkey see, monkey do --
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28th April 2014, 10:32 PM #56
Nalmo
Where did you get your spindle tap ... I got the wrong size from the states. Mine is 1" x 8TPI but I have a NOVA 3000 so should be the same as yours
Dave the turning cowboy
turning wood into art
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28th April 2014, 10:49 PM #57Senior Member
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Dave, I got the spindle tap from Lee Valley in US (from memory, surface postage was about $10), I have 1-1/4 x 8 spindle thread (Nova 1624).
So far, I've had no problems with flying saucers. The bowls are held on very firmly with the bleeder open a small way. For thin walls (which I haven't tried yet), I'd just open it a bit further. The ball bearing is not an airtight seal, nor is the rubber bead. wouldn't be too hard to introduce a few small point for leakage if you were concerned. I have not been able to budge the item with the vacuum running.
I checked the temp of air coming out of the vacuum cleaner outlet. Slightly warm, but not more so than when used for cleaning the house.
I bring up the tail stock to secure the piece once the lathe stops turning, turn off the vacuum, then I don't have to leave the vacuum running & reposition the piece when I continue turning.
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28th April 2014, 10:59 PM #58
Interesting. There are definitely two schools of thought on the subject.
My (Piranha) vacuum cleaner wouldn't be very suitable. It has a valve built into the top that sucks air heavily if the paper filter is clogged, and it also has a temperature cutout switch built in. I used to use it on my OSS before I bought a DC, and it would turn itself off after about 15min of fine dust and would take a couple of hours to 'reset'. The last thing you want is to have the vac shut down mid-turning. That could be bypassed though, I guess.
Either way, I've already shelled out for a vacuum pump which should be here tomorrow or Wednesday.... Steve
-- Monkey see, monkey do --
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28th April 2014, 11:42 PM #59
Interesting thought .... DC system .... could you divert a line of your DC to use for vacuum chucking. I have a DC not set up yet. I guess it would be hard to regulate and know how much pressure you really have
Dave the turning cowboy
turning wood into art
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29th April 2014, 12:00 AM #60
Good question Dave. A bit outside my comfort zone, but the man to ask would be BobL, who usually hangs out in the Dust Extraction forum.
I don't think my little 1000W, 100cfm DC would be much good - it gets pretty hot if the paper filter is clogged. Like a vacuum cleaner, it relies on air flow through the motor for cooling, too.
If it's likely to work, you could probably add a vacuum gauge.... Steve
-- Monkey see, monkey do --
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