- June 5, 2016 at 4:27 pm #13349
Has anyone ever tried to use a heavier conduit or a regular scheduled pipe for more strength? I am trying to decide whether this would be a good option to try for the support frame, and maybe using the lighter conduit for the gantry part of the build. Any thoughts?
ScottJune 5, 2016 at 7:43 pm #13355
As far as I can tell in my area this conduit is the most rigid. Pretty easy to test, I went to the hardware store and flexed all the 10′ lengths. Conduit was the clear winner for me, but you might have something better in your area.
Is your frame flexing too much?June 6, 2016 at 7:32 am #13370
I am getting ready to build one, and was just wondering about the metal rigid conduit instead of the metal EMT. The metal rigid has threaded ends which are not really needed, but this means that the wall thickness is heavier than the metal EMT, so more rigid and less flexing if I wanted to build a bigger cnc work platform.
The rigid is more expensive, but if it makes it much more rigid, maybe worth it?
Just trying to research which way is the best way to build without the need to add support under the frame.
ScottJune 6, 2016 at 7:39 am #13373
Actually the OD for the 3/4″ rigid is (1.050″ / 26.7 mm), so thicker compared to 23.5 mm OD, which would mean more rigid without the worry of flexing. See attached chart where the thickness of rigid would be more than double of the EMT.
Any ideas on this to strengthen the frame up for maybe a 48″ x 48″ build area?
Attachments:June 6, 2016 at 7:44 am #13374
That size is not even in the ball park of working and heavier can also mean is flexes under its own weight. Have you tried flexing it at the hardware store?June 6, 2016 at 7:55 am #13379
Yes I did compare the flexing at the hardware store between them, and rigid does not flex at all compared to EMT. I edited the above post to show the chart comparison between them both.
Why would this not even be in the ball park of working? I am not proposing to making the gantry out of this this heavier material, only the frame that supports the gantry.
Thanks you for your fast responses to these posts! I am just thinking out loud here to see if this might be an option.
Thanks!June 6, 2016 at 7:58 am #13381
we have 23.5 and 25mm od thats it.June 6, 2016 at 8:22 am #13383
If you are worried about flexing along the outside rails just use supports mid way. I have done that on my build and its 5′ square. I can put a lot pretty much all my body weight on the unsupported half section with out flex. That in combination with the new V2 center I am confident I will have few problems cutting.June 6, 2016 at 8:35 am #13385
Oh, I understand that. Is there anyway that us users can modify the needed parts to accommodate the larger conduit? As I see it, the only parts that would need to be modified are the Foot_Bottom, (Bottom_CornerF and BottomM_CornerF), (Lock_CornerF and LockM_CornerF), (Top_CornerF and TopM_CornerF), Spacer_CornerC, and the Roller_F. To me it seems as though a most of these parts only need to probably be scaled up a little bit to make changes. I only can imagine that the Roller_F part would need modifications to make it work properly and still be able to attach the Roller_Motor_Mount without any issues.
Is there a way to get the native file for any of these parts like the Roller_F so that I could easily modify it to make it work?
Thanks!June 6, 2016 at 8:37 am #13386
Thank you Jason! This was my other option to be able to get bigger build area.June 6, 2016 at 10:14 am #13387
Nissan supports offer a 4x increase in rigidity, different conduit probably doesn’t even come close.June 6, 2016 at 10:21 am #13388
Can you tell me what Nissan supports are? Sorry, I am not sure what that is? I am happy to check it out.
Thanks!June 6, 2016 at 10:24 am #13389
Sorry I’m driving. Mid-span supports. Everytime you half the unsupported distance you increase rigidity by 4. Try the supports it is much easier than trying scale my parts the exact right amount and not cause other issues, which it will.June 6, 2016 at 10:27 am #13390
Cool, Thanks! I am guessing that someone already has some supports made for this on thingiverse?June 6, 2016 at 10:43 am #13391
Yup search mpcnc
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