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QUICK-ACTING KNOBS

QUICK-ACTING KNOBS

QUICK-ACTING KNOBS

(OP)
Has anyone here used any of these fast acting knobs from Carr Lane? How reliable are they? Would you be comfortable securing equipment on top of a truck with them?

--
JHG

RE: QUICK-ACTING KNOBS

I think the question should be would you be comfortable with your child driving behind that load.

RE: QUICK-ACTING KNOBS

(OP)
BUGGAR,

I have never used one. I have never handled one. I have never hit one with a hammer. I have never poured coffee on one. I have never seen one. That's why I am asking. I am being asked about quick release fasteners, and I can easily and safely implement studs.

--
JHG

RE: QUICK-ACTING KNOBS

Experience with similar items says that there had better be an independent shear path because sideways motion can cause them to release.

RE: QUICK-ACTING KNOBS

Once they've been tightened I would think that that they would be quite safe. After all, you have to tip them at a NOT insignificant angle before they are permitted to 'slip' off.

Now of course this is all predicated on them remaining tight, so if the service environment has big temperature fluctuations and/or vibrations, then I would say avoid using them. But if that's not going to be an issue, then I think they may be a good solution particularly if being able to quickly and completely remove the knobs is highly desirable.

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

RE: QUICK-ACTING KNOBS

They can wear around their bearing surface at the base, becoming rounded, and can then let go under a slight load relaxation.

Prior experience with similar (hard plastic). Please test them first.

RE: QUICK-ACTING KNOBS

There are many other choices of threaded fasteners that release quickly and tighten firmly... This one is interesting, but, cast & cut threads? To secure a load on a moving truck, NO.

STF

RE: QUICK-ACTING KNOBS

You can get better ones from Misumi that aren't cast... I have used them with great success to hold down jigs/pallets in automated assembly equipment. That said, I would not trust one as far as I could throw it. Well, maybe I would. I could probably throw one about 100 feet or so, and that's about how far I would trust one to secure a load to a truck.

-handleman, CSWP (The new, easy test)

RE: QUICK-ACTING KNOBS

Interesting concept but as a truck load hold-down - not for me, I come from a dog and chain background.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

RE: QUICK-ACTING KNOBS

I've used them on fixtures, where slippage is not usually life-threatening.
They do speed up operations where you have to r&r them a lot.
They hold just fine, if you get them oriented correctly before attempting to tighten them.
If they're just a little cocked when you start tightening, they'll slip off.
Maybe if the extended end seated in a counterbore in a tight fitting thick washer, they would tighten more reliably,
but you'd lose time translating them over a couple of extra pitches.
Even with that modification, ...
No way would I use them to secure a load on a truck.

Mike Halloran
Pembroke Pines, FL, USA

RE: QUICK-ACTING KNOBS

drawoh,

Can you re-engineer your box to include toggle clamps that will catch on a mounted loop/catch that is mounted to the truck? Especially the double-locking style of toggle clamp.

http://www.mcmaster.com/#toggle-clamps/=14jcl7e

RE: QUICK-ACTING KNOBS

How about something like a 'Hood Pin'?

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

RE: QUICK-ACTING KNOBS

I have used these knobs and they work great for many things. However, most of the thread area has been milled away so I would guess that they only have about 25% of the strength of a full nut. I would not rely on them for safety critical holding applications.

RE: QUICK-ACTING KNOBS

(OP)
MikeHalloran,

Thanks. My clearance holes are for M6, so drilling studs and using pins is not an option. My original plan was a threaded, knurled knob, large enough to ensure adequate torque. It looks like I will stick with it.

--
JHG

RE: QUICK-ACTING KNOBS

Anyway you can work in the "Super Snake" wording on you knobs like shown on Mr. Baker's post.

RE: QUICK-ACTING KNOBS

(OP)
BUGGAR,

I cannot see the picture here at work. I saw it at home, so I know it is there.

This is an instrument mounted on a platform on the back of a truck, and I don't see how we could work up a snake theme. Do you think a racing stripe would improve the performance of quick release nuts?

--
JHG

RE: QUICK-ACTING KNOBS

Clearly. Flames would work also.

RE: QUICK-ACTING KNOBS

You can also make the instrument look 50% lighter if you apply decals on the sides that look like carbon-fiber.

STF

RE: QUICK-ACTING KNOBS

Hydro dipping. Have to use the right buzz words.

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