My baby 15" x 15" machine

i had thought about them being a little flimsy but then again it's a 15" piece of 50x25x3mm steel box section, not alu extrusion so i dont really know, i would like to think it wouldnt bend but who knows. and for the record it wont be a simple change to strengthen it without making the machine bigger as the ball screw running through the center of the y axis would prevent any support being added between the 2

jazz is currently looking over this for me as i bust my 2 length limit by about 2 meters which i didnt want to do, but it's not the end of the world it's only another £30. however i have a feeling it's all going to change

Wilfy, its a good job you are such an expert with sketchup (wish I could hack it), but it looks like you are getting close to this build now Good luck, G.

i got all my help from this thread
http://www.mycncuk.com/forums/cad-ca...iscussion.html

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Originally Posted by wilfy

i bust my 2 length limit by about 2 meters which i didnt want to do, but it's not the end of the world it's only another £30. however i have a feeling it's all going to change

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In the corners of the machine you have a long vertical piece that the ballscrew mounts to and you also have a short vertical piece that doesn't seem to be doing anything, could you get rid of the short pieces to save your self some length?

If you have a load of flatbar left over you could also use that for the cross members of the bed instead of box section, that should get you back to your 2 length goal.

i cant see how 3mm flat bar can replace a 50x25mm piece of box section, the bed bending is the one thing i'd imagine u dont want. also the upright i could get rid of, but the little white spacers are all that the rails will be mounted to. i'd rather over spend and have solid for the sake of £30.. if it was another £100 i'd be more worried

Hi Wilfy,

Had a play see what you think to this.? It's well within the 2 lengths but it does use 50x6mm (or5mm) flat instead of 25mm but you'll see why.

Although slightly taller this way strengthens and helps with squareness of quite few area's and allows the screws to be brought down and to the side which will help with crap hitting them.
Because your using twin screws you can get away with slightly less bearing spacing so gained you about 90-100mm extra in the X axis (twinscrews) by shortening the bearing spacing slightly and off setting the rails back.

Let me know what you think and I'll tidy up the model and send back.!

Edit: Blue is 50x25mm Red 50x6mm
Edit2: Oh and if you don't like it then don't be afraid to say so you won't offend me.!

looks awesome and very professional and its funny cuz i had the screws there on the x axis the first time. i feel happier about the rails not bending on the x and y axis with the supports and i didnt realise i wouldnt need to support the back of the y carriage. and if you gained me back some x axis length then thats even better.

brilliant thanks a lot dude.. if you gonna send me the drawing can u send it as a dwg, dxf, skp, 3ds, dem or ddf... strangely enough sketchup lets you export as an OBJ but wont let u import as one :S

Looks like you are getting the hang of skp. What travel are you getting on you x and y?

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Originally Posted by wilfy

enough sketchup lets you export as an OBJ but wont let u import as one :S

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that's google trying to annoy you into forking out for the full version!

it is the full version... erm travel i'm looking at 400+ on the x and 525ish on the y with 100 z in mm ofc