My 4x8 project has started

[MetalHead6263]

I m using 600 oz. motors , dragon cut kit from c andcnc

[zool]

NIC 77 stated:


I'm about to start a 4 x 8 cutting area shopdroids build myself. It's going to be for Routing and Plasma. The one weakness, in my opinion, of using the shopdroids design for larger builds is the lack of stiffness. An aluminum T-slot extrusion 2 inches by 2 inches could have alot of flex over a 4 foot span.

NIC 77, I am builting a Shop Droid for routing that is 83-inches by 53-inches. I use 3030 t-slot from 8020. ShopDroid [custom sized]

I did moment of inertia calculations on the 83-inch length and with the use of a leg in the middle got the deflection to 3/10,000-inch assuming a load of 500-pounds evenly distributed, and support only at both ends and in the middle, and this did not take into consideration any of the cross beams which reduces deflection even more.

Though I do not have the statistics for the material you are going to use, my suggestion to reduce deflection to next to nothing would be to put a leg in the middle of both the sides. The deflection over two-feet will be almost nil. The deflection over the 8-foot side will be almost nil as well.

[NIC 77]

Zool,

I've replied to your post in your build thread. I don't want to hijack this thread any more than I have with my long winded comments, and I've got alot to say about your post.

[MetalHead6263]

O k , boy what an experience this has been . Newbies heres some info , after the table is built thats the easy part [ more on that later ]. But today damn it ,I roboticaly designed and cut my first part !!!!
Heres a pic of third cut on my slat design

[MetalHead6263]

B y part three the outer part just feel off , so cool ! Stiil gotta lot to learn .

I had never seen sheet cam or a design program or mach till a few weeks a go . I kept telling my self , something my 84 year old former brick mason father in law told me once . I ask him how he learned the trade , he said I saw some brick masons working one day and I just told my self that if they can do it , so can I !

[MetalHead6263]

O h what a roller coaster week it has been , My primary business is sucking bad right now , due largely to the idiots running the country . So I tried to stay up beat , but it was very hard . I got stuck on numerous little details trying to get the machine to cut , so now at this very monent , I will open ice cold beer number three !

[MetalHead6263]

Slat jig I made

[MetalHead6263]

Slats all installed , Homing switches mounted on hard stops I got the d t h c
running today .

[MetalHead6263]

320 ipm ,direct drive ,this is how it fell out of the sheet untouched .
I thought this was pretty good for a complete rookie , who never saw sheetcam , mach , candcnc stuff until a few months ago .

Belt reductions are currently being built

[MetalHead6263]

Still tinkering with my machine . I scored a water tank from Culligan water ,dumpster diving . Its a wellmate , heavy fiberglass 120 gal . about 600.00 new , I got for free . They didn't know what was wrong with it , turns out a busted pvc fitting on the outside of it .
Added a swivel monitor stand , e trac on y so far . shelves for my cpu .

[dustin1706]

Looks great! Simple and obviously very effective.

[HamerDownJustin]

I m using 600 oz. motors , dragon cut kit from c andcnc

I am also very new to this...I have a little corel experince making the dxf files etc...but none with the sheetcam...when you put a dxf file in the sheet cam does it automacticly change to the code so the machine nows where to start? ordering my parts tonight thx for any advice or info