New Machine Build- 8020 build 3x5

[sieg01]

I got two 72 inch ones and cut one for the y and z.

I used the full length of the screw on the X. I was trying to maximize the length on my X.

I only used 1530 so I'm pretty sure I'm going to be seeing some deflection. I haven't cut anything where that would be critical yet. I do have some plans to reinforce it. I'm thinking of mounting a piece of angle iron.

Opps I gotta run to breakfast...

[ahren]

Filling the center of the extrusion with concrete will not help much with deflection. Concrete is strong in compression, but weak in bending, and you aren't gaining any real geometry advantage regardless. If you wanted to stiffen an extrusion, by far the best way is to bolt steel onto the sides, but even this is inferior to even a slightly taller extrusion. If you want a machine like Sieg's to cut harder materials or take deeper cuts, I would suggest running screws on both sides. That way, you don't need the cross bar going underneath, so you can bolt the whole machine to a rigid table, or at least support the center of the long span.

Ahren
www.cncrouterparts.com

[sieg01]

Well I'll finish my thought. I'll probably mount a piece of angle iron or square tubing to the side to stiffen it up some and keep the woodchips from getting on my rail. That should help with the stiffness quite a bit also. I've been poking around deflection calculators to see if I can figure out how much it would help.

If I was to do it all over again I would probably go for the 3030 or for the dual screw on the x-axis.

[Buick455]

Well mines back on the drawing board.. I noticed something as I was drawing it up that maybe you will have some insight on.. In Google Sketch Up I have noticed that by useng ahren's Z-plate the upper half of my router might hit the motor mount bracket (nema 23).. the Z-plate actually moves the router closer to the Z by 1 3/4". I could be completely wrong though b/c the model of a Porter Cable router was imported from the Sketch Up site, and might not be to scale.. Any thoughts?

[ahren]

Can you post a picture of your sketchup file? That's the best way to see the potential issue. The K2CNC mount should be attached really low on the z-plate, so I find it hard to believe there's a problem. Even if there is an interference, it would be at the top of travel, so you can just add some length to the extrusion for your z.

Ahren
www.cncrouterparts.com

[Buick455]

Ok this is a warning to all that use Sketch Up, Objects rendered may be larger then their real life counterparts, lol. I went out and mesured my 690 PC router and the armature half is 4" and the spindle tube is only 3.5".. So to make a long story short the one from SketchUps 3d models site is wayyyyy off.

the offender!


If anyone has sketch up models of the router thats right and maybe a k2 mount I'd love to have them.. If not I'll slap something together.. I'm only useing Sketch Up to find screw ups in my plan and make a rough BOM lists

[sieg01]

I've been out of the shop since Christmas... I don't yet have a big enough heater to warm me on those days below 0.

But I've been spending the past few days now that it has warmed up getting everything all tuned up. Mostly on my long x-axis, I felt like my bearing weren't tight enough on the rails and also between some of the opposing carriages.

Also I was getting dust and chips on the rail which would cause problems. I think I have helped with the by mounting a piece of angle iron so that it blocks the rail from the majority of the dust (it also helps to stiffen up that axis)

Ahren, Did you have any tips for getting the carriages all tuned up between the bearings on each carriage and between other carriages on the same axis? And what do you do from keeping stray dust of the rail?