Dual Vee Wheels

[wdp67]

Anybody got any experience building a router using these wheels. Please tell me how it worked out and show some pics if you can.

Thanks
Walt

[ger21]

This one here used them. Unfortunately, all the pics in the thread are gone.
Ted's Machine Starting at Sq #1

[GaryCorlew]

http://ww.mechmate.com

[Switcher]

http://www.cnczone.com/gallery/showphoto.php/photo/114

http://www.cnczone.com/gallery/showphoto.php/photo/232

.

[wcarrothers1]

Here are some pics on the 4x8 project

Don't know if these are the type of V wheels you are thinking about how ever I can say they work well on my machine

b.

[wdp67]

Yeah those are the ones, what do you guys think of this for x and y made out of MDF and Angle iron.

[wcarrothers1]

While I believe the ones I have are dual row bearings I would not consider them lateral contact races. By that I mean loading them sideways the way you are may not exactly be the direction they have the most support. having the load to their shaft is the way they are suposed to ride far as I know. They might have a chart you can figure out what their vertical vs sideways loads are rated at.

I would not do it like that my self.. I'd make them ride as I did.

b.

[wcarrothers1]

Also the larger ones like I used are not all that cheep (depending on how lucky you get getting them) so keep in mind they add up (cost wise) quick...

b.

[ger21]

How do you mount a spindle to that?

I do like the horizontal rail idea, though. I may incorporate that for the X rails on the machine I'm designing. Looking at the BWC catalog, it looks like as you widen the rails (from angle to angle), the axial load decreases, if the load is in the center. After some quick math, it looks like as you double the width, the axial load decreases by half. The #2 size rollers are rated at 140lbs axial load.
Based on the formulas I see in the catalog, a 200lb load gantry, with the load centered on the carriage, with the rollers axles at 4" OC (2-5/8" across the points of the angles), would give an axial loading of about 38lbs/wheel. Well below the 140lb rating.

Unfortunately, where the loads are actually coming from during motion is a bit more tricky to figure out, and not so simple. And feel free to check my math. Download the catalog at www.bwc.com

[wdp67]

So what would you do different to make it a viable idea? As far as mounting the z I would mount it to the carriage on the y axis.

[wdp67]

I am not done with the drawing, I was just playing around today and came up with that. The best way to mount the z might be to turn the y on its side and build a torsion box. I am no engineer, Just want to build a nice router and looking for ideas.

Thanks
Walt

[wdp67]

I know not the best drawing but how bout something like this? you could use rollers on both the top and front to keep the z from any movement.

Walt