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Need help on round nylon type material “not so slippery”’

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Cadillac STS

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#1
I’m working on an adjustable arm system to hold my vacuum end to keep it held where the spindle is on my mill during cutting a part, CNC mill. I can hold the vac where I want it but it would be better to set it where I want and have it stay. Also could help hold coolant lines as needed in place and not move.

I looked at some holding devices but all were not stout enough to hold the vac hose.

So I decided to go with making a larger version of a traditional ball and link system. Using 2 inch towing balls for a car. First one is a welded 2 inch painted ball on a 2 inch receiver bar fo the base. That will be able to be bolted to my mill table. Next is a double ball, one connected to the other for the middle link. Last is a 2 inch chrome steel ball with the 3/4 inch threaded end. Plan is I can make fixtures that can bolt on to the end of the arm and it will be powerful.

(When I am done I'll post some pictures)

For the connecting links I am using 7/8 X 2 X 8 inch aluminum bars. Held in the middle with a 6 inch 3/4 carriage bolt and nut. Then for the pads that squeeze the balls to hold (This is the question of the thread) I used 1 inch nylon round stock. I put a 2 inch ball router bit in the tail stock of my lathe and it cuts a nice 2 inch concave for the pads, other end of the pad is a 3/4 inch hub to go in the aluminum bar.

Problem with first model is it works but on the painted ball the nylon slips. It holds the steel chrome balls ok but the painted first ball slips. I need a material that will hold but not mar up the balls.

So I need a suggestion for a material that is not as slippery as nylon. Still machinable so I can cut it easily in my lathe and not wear the router ball bit too much. Would PVC rod work better? Polyethylene? Need to be able to buy a foot or so to make 8 pads from. 1 inch to 1.25 max diameter. Would a firm or stiff rubber product work and what would it be called?
 

derf

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#2
Skip the pads and just drill a hole in the arms to seat on the balls.
 

hman

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#3
Might it be possible to give the balls a light sand blast or bead blast finish? This would certainly allow the nylon to grab securely. The question for you would be whether you want to keep the existing finish(es) on the ball(s).

It's probably a bit late for me to offer you an alternative to the trailer hitch balls ... but there's a line of products called "RAM Mounts" that use rubberized 1" balls and double socket bars. I used to use one to mount a GPS unit on my boat. It held VERY securely. They make a full line of products designed to hold electronics, fishing rods, cameras, etc. on motorcycles, boats, cars etc. Many of the mounts are easily adaptable for machine shop use.

https://www.rammount.com

https://www.amazon.com/l/2599345011
 

JimDawson

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#4
If you don't have a tool changer, this works pretty well. I built this for cutting MDF, pretty much eliminates the dust.

1540797313913.png
 

Cadillac STS

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#5
Could do that but it would mar up the balls. Then comes rust..

(About not using pads and just the holes noted above. Or roughing up the steel trailer hitch balls.)
 
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Cadillac STS

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Might it be possible to give the balls a light sand blast or bead blast finish? This would certainly allow the nylon to grab securely. The question for you would be whether you want to keep the existing finish(es) on the ball(s).

It's probably a bit late for me to offer you an alternative to the trailer hitch balls ... but there's a line of products called "RAM Mounts" that use rubberized 1" balls and double socket bars. I used to use one to mount a GPS unit on my boat. It held VERY securely. They make a full line of products designed to hold electronics, fishing rods, cameras, etc. on motorcycles, boats, cars etc. Many of the mounts are easily adaptable for machine shop use.

https://www.rammount.com

https://www.amazon.com/l/2599345011

Very nice, and they sell individual components too with low prices. If I pack it in I'll go with this product but I'm pretty far into the project already. But you got the idea right on.
 

derf

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#7
You must have one BIG vac system...the size of balls and arms that you propose could hold a car! Here is what I use on my manual mill, it's just an old work light mount.
vacmt.jpg
vacmt2.jpg
 

Cadillac STS

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#8
Solved the problem by increasing the size of the nylon pads to 1.75 inches. More surface area more grip.

But..

My setup was way too large for what I needed. I ended up ordering some Ram Mount components that worked perfectly. I bought one one inch rubberized ball on 3/8 16 bolt, milled a custom T nut to hold that to the table. Two two inch links they are nice powder coated aluminum. Two double rubberized ball links. And then the medium claw mount with one inch ball. The claw is usually for mounting on a post but I used it to hold the vacuum hose. Nice high strength setup, looks good and is easy to adjust

Thanks to the forum for ideas.. my setup too large, the Ram Mount idea..
 

derf

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#9
Pics?
 

Brnoczech

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Yes, Pictures please of final solution.
 

Cadillac STS

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Here is the picture of the current setup. I wanted the vac to stay with the vise wherever it was because I was used to holding the vac hose at the chuck in same place so much. I will mount a one inch rubberized ball on each side of the spindle base (Off the table) so the vac can hold where the end mill is for larger things later. Also the mounts at the spindle base sides could be used for directing coolant.

I was able to get some of the links with "Make and Offer" on eBay for $7.50 each so that helped the cost. But I did buy more than I currently need, thinking of the coolant setup later or dual vac hoses both sides.

It is on my Rong Fu 31 CNC. I also have a Bridgeport that I may put same setup on although I don't use the Bridgeport as much anymore since I have the Rong Fu CNC.

Can also see my Bridgeport vintage quick change set in the R8 taper. I can change tool there and not need to touch the drawbar. I have a nice array of those Bridgeport quick change parts now, have been laying low about it the last years to avoid competition buying them when they come for sale...


RamMountjpeg.jpeg
 
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