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Question about wheels to use for moving a fixture on an 1/2'' angle rail
9

Question about wheels to use for moving a fixture on an 1/2'' angle rail

Question about wheels to use for moving a fixture on an 1/2'' angle rail

(OP)
Hi guys,
I want to move a fixture that's 100 pounds forward and back (back and forth) on 1/2'' angle rails.
Do you know of any flange wheels or have suggestions on what wheels to use for my application?
Please see attached sketch of my application, black is a bracket that I plan to mount my wheels to, green are the wheels.

I'm looking for a mechanism to guide the fixture, that's why I put a set of perpendicular wheels, right hand shown only.

I'm considering some type of wheels with flanges or maybe v-groove wheels that can sustain a load of 100-200 lbs.

Any input?

Thank you,

RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

The arrangement shown stands a good chance of having high contact stresses that will quickly destroy the edge. If you are looking at v-groove wheels, consider using the weld-on track - dualvee

RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

Yes, the edge of a rolled-form shape, the 'angle rail', is not a suitable solution, both in terms of the as-manufactured tolerance and finish, and as has been noted, wear-ability. I would think that the already suggested 'DualVeeĀ®' system would be exactly what you're looking for. And BTW, the 'V-rails' do not need to be welded-on. They offer several schemes for holding sections of the 'V-rail' so I'm sure that you'll find something which will work for your application.

John R. Baker, P.E. (ret)
Irvine, CA
Siemens PLM:

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

RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

I'd also look at similar designs for reference when determining an approach. The first example I think of is a locomotive rail. They use a flanged wheel so no need for a lateral wheel. This is similar to the DualVee product referenced earlier where the V design provides your lateral alignment to the rail.

<tg>

http://xdi.me
"If there's something in life you don't like, change it and deal with the consequences." - James Tanton

RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

If the load is only 100 pounds or so, as indicated by the OP, even miniature 'Light Rails', the smallest of which is 2 5/8 inch high, would be overkill.

John R. Baker, P.E. (ret)
Irvine, CA
Siemens PLM:

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

RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

Cheaper than V rail.

RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

What does the other side look like? It seems like there is an overhung load showing, v-groove wheels will not restrain any uplift. It looks like some linear bearings and rail are used. A little more of the story might be helpful.

RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

Why not turn the angle section by 90 deg. with the apex upward and use a grooved wheel, the wheel/s could be steel, rubber or other material to suit your requirements, this it will keep it tracking straight and distribute the load more evenly.

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: Question about wheels to use for moving a fixture on an 1/2'' angle rail

For such a low load your could probably get away with garage door rollers.

RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

2
Do not do it as you have shown. First, the upper wheel will quickly wear out from virtual line contact. Second, the edge of standard angle iron is NOT flat or straight. There are many better options.

The inverted angle with a V-wheel, as suggested above, is a popular option. And it works well...BUT ... the most common mistake made in that arrangement is in the designer's assumption that two inverted angle rails can ever be parallel. They cannot. First, because they aren't exactly straight. And second, even if they were straight, it is impossible to mount two angle rails perfectly parallel. The most common solution to this problem is to use v-wheels on inverted angle on one side of the load, and flat wheels on flat rail on the opposite side. That way the flat wheels will follow the lateral guidance of the v-wheels.

RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

As mentioned by others, an inverted V for one rail, combined with a flat rail is a nice solution.

Even suitable for high precision applications.
Popular in machine tools.
http://www.lathes.co.uk/nuttall/img11.jpg
The v-rail is close to the hand wheels on the carriage.
The flat rail is closer to the chain link fence.


RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

(OP)
I think I'm going to go with the setup mentioned previously of v-wheels on inverted angle on one side of the load, and flat wheels on flat rail on the opposite side.
Do you guys know where I can procure flat wheels with concentric and eccentric bushings, that I can adjust just to make it a tight tolerance?

RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

How big? How precise?
Application information? Speed? Duty cycle?

All standard caster companies offer both v-wheel and flat. But eccentric bushings? Not so much.
McMaster has eccentric bushings.
Several good sources come to mind:
Osborn (loadrunners.com)
Bishop Wisecarver (bwc.com)
PBS Linear (pbclinear.com)

Another thought: You don't necessarily need eccentric bushings to level your payload. Often a well-placed shim in the mounting arrangement will do the trick.

RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

(OP)
Do you guys have any design ideas for this setup?

Wheels vertical and horizontal that will run on the track, we're gonna use flat wheels with eccentric bushings on the horizontal wheels for adjustability. I'm having a difficult time dealing with how to fasten the horizontal wheels, any ideas?

RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

the horizontal and vertical rollers do not have to be inline. are you doing this on both sides of machine? please show both sides so folks understand your design - i.e., a cut section through your gizmo. you may end up at the same price point by using something store-bought - https://pbclinear.com/product-features/cam-roller-technology

RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

If done properly, you may only need the so-called 'horizontal' wheels on one side, if the other side only needs 'vertical' wheels to support the overall mechanism. Optionally, you could use 'horizontal' wheels on both sides, but only one set on each side, either on the inside of the support rails or on the outside.

John R. Baker, P.E. (ret)
Irvine, CA
Siemens PLM:

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

RE: Question about wheels to use for moving a fixture on an 1/2'' angle rail

looks extremely complicated and expensive compared to an inverted angle etc as already proposed.

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.)

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