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Thread: vacuum chuck help needed please!
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12th June 2021, 12:10 PM #1SENIOR MEMBER
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vacuum chuck help needed please!
I bought a Vicmarc V01216 Rotating Union M40 x 2(Size:10mm)
and a vacuum pump and manifold. I've set it up I believe correctly and this is what i get.....
If I stick my thumb on the end of the pipe that goes into the rotating union I can feel and hear the suction and the dial moves dramatically. Soon as I connect that pipe to the rotating union all suction stops and its not even strong enough to hold a piece of paper.
What have I done
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13th June 2021, 12:28 PM #2GOLD MEMBER
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If no one comes up with an answer on the forum , I suggest you give Vismarc a ring .I have always found them very helpfull .
Ted
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13th June 2021, 06:31 PM #3
I've only used the outboard version of their union on my lathe but could you be leaking vacuum from the outboard side of your headstock?
Maybe some pictures could help?
Good luck
Cheers
Josh
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13th June 2021, 06:52 PM #4
You're just plugging the rotating union into the vac hose? Is it fitted to the head-stock spindle or not?
I had similar problems with a different brand, when I ran the vac pump too high and damaged the internal seals.
- Andy Mc
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13th June 2021, 08:27 PM #5SENIOR MEMBER
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14th June 2021, 01:10 AM #6SENIOR MEMBER
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Looking at the top picture, I see 14 possible leak points. Then you have a bunch more that is not seen. Because of the numerous leak factors, I went another route. I invented the Tail Stock Steady. It is such a simple device that I'm surprised it hadn't already been invented. I've been using it now for 10 years with my only 3 failures occurring in the first 2 weeks of using the first prototype.
562992E2-10A2-428C-9829-D09AE35049B9.jpg28FB8768-6405-4ED1-BB33-E6AD34BF3863.jpg
7D013EC4-1FA6-402C-AD63-8075992E0033.jpg
It also allows bottom embellishments like decorations and finials if you have a pedestal form. This is done safely between centers and you never have to worry if will launch unless you forget to tighten tailstock. I've done pieces with a foot as small as 1 1/2" and diameters all the way up 19 1/2". Never worried if it was going to fail.
I'm not trying to sell you one because of the international shipping and taxes. The cost is about half of what a vac system would be but is a whole lot more secure. If you think you might have some interest, go to my website Wood Turning Tools | Tucson | WoodTurners WorkHolding Solutions. From there, click on the youtube icon, and watch a few boring videos. I'm basically trying to get more exposure on a simple tool that isn't noisy, isn't dependent on a bunch of leak prone hoses, and is as easy to install as a live center. ........... Jerry (in Tucson)USA
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1st July 2021, 08:33 AM #7
leaks
You have a leak and its the rotary union send it back. If it all works before using the union then thats it, not unusual to have a failure. Try connecting the union directly to the vac pump to test it.
Inspiration exists, but it has to find you working. — Pablo Picasso
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1st July 2021, 08:15 PM #8SENIOR MEMBER
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good idea!
I did return it to Vicmarc and they were good enough to send a new one out. This one I can feel the vacuum come through but its very weak and will barely hold paper. I've since made one myself just using a sealed bearing some wood, silicon and the vacuum cup I also bought and that works so much better!
The chances of getting 2 dodgy ones must be slim so I don't know if I've done something wrong or not. I have a friend who has a better vacuum pump, hopefully it works for him. I've spent the last 2 or 3 weeks on it and have produced nothing but frustration so maybe I'm being told something by the turning gods!!!
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3rd July 2021, 08:58 PM #9
You may have to go over all the joints and replace the ptfe tape making sure its wound on the correct way. Be mindful of over tightening may crack a fitting, It doesnt look like there's much ptfe tape on the vac head fitting. I use something like this although not this brand, it seals better than tape IMHO.
https://www.automegastore.com.au/per...hoCq70QAvD_BwEInspiration exists, but it has to find you working. — Pablo Picasso
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