Thread: A sufficiently strong machine
Thanks for the detailed explanation.
However i would like to design mine machine quite bigger, up to the point that i am tempted to reach and surpass the length limit of the ball screws on the long axis. I don't intend to do steel though. I wonder if i am right that with this gantry design + 2 nuts at each of the long sides/x/ i could go with longer 1610 screws, say like 1800mm or even 2000, cause if i separate the bearing blocks that move the gantry say 400mm that gives screw lengths like - (1800-400) /2 = 600mm from each side if gantry is in the middle and 1400 if gantry is at one end, which more or less i assume is the limit before whipping occurs.
So, from your point of view, what are the things i should concentrate if i upscale the machine?
Apart from the obvious, like sturdy frame and gantry. I intend to use 100x100x4 profile and 100x100x? for the gantry.
and possibly size 30 Hiwin rolller bearing slides, instead of ball. I am planning to mount possibly an impact air hammer, so it seems i will further strengthen vertically one side of the gantry adding one more profile
For now it seems to me the limiting factor to all will be the gantry weight/strength ratio, so if i am right i could upscale until one reaches limit/weight for the given motors or strength for the chosen length/
I'm sure if you where to model accurately this full machine in Cad and add the rails like I suggest so load is spread across 3 areas then do a Stress analysis on it in all directions and compare deflection at the cutting tip you'll see a difference worth the effort compared to just adding another bearing on each rail or increasing rail/bearing size.?
All said and done thou Whether it's worth the effort is dependant on it's use and it's current design it isn't exactly flimsy is it so probably fine for 99.9% of any HD-DIY work.!!
Last edited by JAZZCNC; 26-10-2013 at 11:06 PM.
exactly the level of detail i needed to factor both the advantages and disadvantages and the associated costings. If ever am up your way, i owe you a coffie
Absolutely brilliant machine and many thanks for posting the project Jonathon. Will you be posting the files and costings on here?
Last edited by superpot; 21-11-2013 at 04:22 PM.
Ive read The thread a couple of time and watched the video A very inspiring thread.
That is impressive well done.
This is a great machine and it has sparked off some ideas for the design of my first build. Thanks for the detailed posting. VERY useful.
hi Jonathan , super build, well done. where can i access the dwgs and BOM for this build. i am putting together a costing for a home build similar to this baby and would love to incorporate some of the ideas. any help to get me down the track that bit faster would be greatly appreciated. Dermot.
How did I miss this when it first came out? Maybe I didn't miss it, maybe it's my ancient memory box fading again. Whatever I like it
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