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It took a bit longer than I thought it would, but she's running!!!
Some pics:
http://i1067.photobucket.com/albums/u428/Boomslang3/BoomslangCNC.jpg
...

The pics you posted is of the strongest part of your design, if you run the sim with load on the end of the fully extended Z axis it will look much worse I think.... then add to that racking on the...

I'm sure your machine will cut some stuff, but that Z-axis and very close bearing spacing on the rest is simply not the best way to go.... I say do some more designs before you start building....

I went with 100kg load, but that's also just 'thumb suck....
Try making the mesh smaller in the simulation, exclude parts that will not affect the results, If you have a round bearing face running...

Nice! Good to see the cyclone design validated.
Now start building!!! If anything flex in the end, you can just add some more metal. Would love to see some deformation simulations of the cnc with...

For now, mostly wood. Later on I intend on putting a 3 to 5hp spindle and flood cooling for aluminium, but will see what my 1.5hp router can do in the meantime.

The main bed frame was built,...

I did some serious welding on my mild steel frame, and the end result is straight to within 0.2mm. After the bearings are attached and spoilboard cut I don't even think it will need shimming. (the...

Use them as door handles.... :D For what you want to do, you need supported rails, and nothing else. Especially with the high Z axis.

Cheers,

All up weight (excl concrete) is about 170kg. The gantry moving weight will be 53kg (the metal part of gantry as in the photo is 25kg).

Might be over-kill :) When I can afford bigger steppers or servos I can fill the machine with epoxy-granite and cut stainless-steel with it ...hehe ok maybe not S/S......

I hope to cut a proper Z axis from alluminium using the macine, so the wood is only temporary.

:D

It's the floor that's "leaning", the machine is 100% level.

Extended the legs and cemented them into the ground. Also filled the them up.

PIC:
http://i20.photobucket.com/albums/b209/Boomslang1/100_0314_Medium.jpg

Cheers,

Hi

Did not read through the whole thread, so maybe it's been mentioned...
From the simulations I did, I found the the lower Y bearing takes the most force from the Z axis. Maybe put another piece...

Got it all welded up and painted (Rustoleum Hammered), the electronics are in the post... making some progress.

Few update pics:
...

Thanks for the info tskguy. I will probably only fill parts of the bed. The moving gantry weight will be 50kg as it is, but if the steppers can handle it I might fill it as well.

Planning on using...

Affter seeing a program on Discovery about rollercoasters I am thinking of filling it with sand. They say it dampens rollercoaster noise by at least half. Was also thinking of just mixing sand and...

Thanks, will take a look. Not sure what my budget is, but it looks like it will be around $1800 excluding spindle. So far the steel set me back $280.

It did warp some, but I made some provision for that in the design. Almost finished with the CAD design, have it far enough to do some more simulations.

Below sim was done with 100kg force...

SolidWorks

Got some pics last night, not the best quality...

Front right:
http://i20.photobucket.com/albums/b209/Boomslang1/100_0291_Medium.jpg

Rear right:...

:D Knew someone would ask.

Will get some pics this weekend.

Another quick update:

PIC:
http://i20.photobucket.com/albums/b209/Boomslang1/Render2.jpg

Over the last 2 weeks I built it as far as the render. Most of welding done, now it's grinding then...

After many designs and simulations this is where I am now:

http://i20.photobucket.com/albums/b209/Boomslang1/CaptureV3.jpg

Decided on using mild steel. Above simulation was done with 100kg...

Is this the design you intend to use? Unsupported rails will not do the job.

Thanks for the info RomanLini. I want to get the stepper package from cncrouterparts, with the G540 and 48V PSU, so should get close to what the graph show...... I hope.

Been trying to simulate...

Looking very good!!!

Is the bottom rail on Y supported?

Thanks for the info. Looks like 15K PPS is a good number to aim for... giving 450rpm on 1/10th microstep. 5mm per turn = 2250mm per minute = 88.5 ipm. Not very rapid :D

10mm per turn will give...

:D :D Thanks!!!!

Sorry to budge in, but does anyone have a spreadsheet they would like to share that will calculate the above? (too lazy..... ;) )