Definately a scrapyard challenge

[JAZZCNC]

LMFAO. . . I've got to tell you my son's response to seeing me smiling to my self while writing that.!

" No you wouldn't, You'd test the Moment of inertia of his head with the ballscrews to see if they produced enough Kenetic energy to clear the Big Wall"

Personally I don't know why he'd think that.?? . . . . I didn't know there was Big wall:naughty:

[wiatroda]

LMFAO. . .

" No you wouldn't, You'd test the Moment of inertia of his head with the ballscrews to see if they produced enough Kenetic energy to clear the Big Wall"

Personally I don't know why he'd think that.?? . . . . I didn't know there was Big wall:naughty:

:rofl::rofl::rofl: Did he mean Big Wall around Big Brother' house?:rofl:
So you would do empiric aspect of the job , leaving formulas and calculation for Jonathan ??:naughty:

[motoxy]

Jonathan - i am having that quote as my signature. Thanks.

As for all the spat Your both absolutely right. Without calculations we would have no idea what could be achieved. But suck it and see can be so much fun. Somewhere in the middle would be where you find success.

Now if its alright with you guys I would like to have my thread back. :wave:

I have thought about my gantry today. Repairing fences can be boring. How about 80 x 40 Al profile as the cross rail with the 10mm thick ally side fixed to cut down version of the 10mm thick angle? I will draw over the weekend.

Bruce
Value frame are cheaper than marchant and dice.

[motoxy]

Just been given an old computer for the project. Checked it out....chucked it out. Boy some comps are really old.

Got the balls back in the screw but i will have to make up a guide tomorrow as they push out when you try to screw it together.
I am going to check out my supplier to see what ally box he as available and will then decide what to do about the gantry.

Bruce

[Swarfing]

Bruce roll up some cereal packet cardboard for now and find something to pack the middle out once inside.

[motoxy]

2e0poz you are yet another genius on this site....I have a functioning ball screw. Thanks everyone for your help. Nice to realise I am not the only curious one on this site that justhad to look inside

Bruce

[motoxy]

Hi Jonathan

I am beginning to see where your coming from. I have taken on board previous comment about the over hang over the x rails. At the moment their 700mm but I could reduce this to 600. I am going in on monday to see what box is available.I thought about 80 x 40 with the rails top and bottom.

Bruce

[Jonathan]

I thought about 80 x 40 with the rails top and bottom.

80x40x3 box section is less than a third as torsionally stiff as an 80x80x3 box section. Same reason as before - material is distributed further from the centroid with a square compared to a rectangle.

These photos show mine (old pictures!) with the size I mentioned. I put 20mm thick plate in the ends of the box section to make as strong joint.

[motoxy]

emmm. okay. I have looked on line and 3" x 3" x 10 swg (3.2mm) is easily available. My limitation is no access to a mill. All my work is bench work. But I am sure I can come up with something.
I feel I have come a long way since i started reading the site where someone was building a plywood cnc on his kitchen table. I have t admit that I am glad to be getting so much advice that does make sense.....so far

BTW I have made an offer on the spindle. See if he bites???

Jonathan may I ask what you are studying at uni?

Bruce

closing off see you all tomorrow some time.

[Swarfing]

See your mum was right? there was reason why she said to eat up your weetabix in the morning:whistling: