a Steel Box Section Build with SBR20 & Ballscrews Plus a few questions

[JAZZCNC]

I'm still not sure on running the screws with one motor either the only way I can see at the moment is running 2 motors. I don't want to really have the belts running across the rear just in case I want to use long material that can hang over the edge.

Nothing wrong with using 2 motors provided it's done correctly and they are run well within there capabilty's and using good electronics.!

[grain_r]

Good Evening well I have been lurking on here for a while again and watching everyone making steps forward. I have ordered placed and collected my box section although if I did it again I would opt for 5mm instead of 3mm steel as I think I have given myself a few mini headaches of threading and bolting and would have only been another £50.00 but oh well you live and learn.



The total metal cost was really good I thought I would put the costings on here to help people designing machines as a basis pricing although this price was specific to my machine.

X1 - Cut List – 500 MM 5mm x 50mm Flat Bar £5.00 each
X2 1300.00 mm – Top Rails
X4 550.00 mm – Legs
X2 1032.00 mm Side Bars
X4 287.00 mm Side Uprights
X8 230.4mm Angles
X3 950.00 mm End Support & Mid Supports
X2 95.00 Table Ends
X2 1032.00 mm Table Middle Lengths
X2 850.00 Table Middle Supports
X2 952.00 Gantry Horizontals
X2 200mm Gantry Seats
ALL OF THE BOX SECTION IN 5MM £155.00 LUMP SUM
ALL OF THE BOX SECTION IN 3MM £100.00 LUMP SUM

I had the metal cut because as I said in the email to the company that was cutting it I wouldn't be able to get as accurate as they would, (Well that certainly wasn't true) the cuts are withing 1mm as they said but that just happens to be on the one side they are really out. but at least it did all fit in the car this way oh well.

I thought it might take an eternity to get the accuracy with a file and so I have now purchased a SIP sander & Lanisher (I have always wanted one anyway so a nice justification ) I know it says no metal but it is really good and I am now getting the ends half correct and then finishing them on the Sander it is so well built it doesn't complain at all so I will certainly be buying SIP again.


Well it has then sat there for a while and so the other night I just had to sit there and measure every piece and I have now labelled everything (I should have done this before) and it now makes sense again. also if I had done this straight away when I bought the metal I would have found that my top rail was not in the pile so I will get another and this time I'm cutting it. at least I will get to play with the sander again.
Not a single piece of wood is safe in my garage.


I have been learning tig welding for the project by making a welding trolley as everyone always seems too and I am needing the grinder less now. so its all relevant for the project, I always seem to be going the other way and start making something else to make the next thing in the chain.












Well at least its all practice. I started out wanting a welding trolley and what I have finished with is a welding go cart well al-right nearly finished.

[JAZZCNC]

Hi rob,

Nice to see you back again thou would nicer still to see pics of a welded frame so get the welder fired up and lets see some action. . Lol

Don't worry too much about only being 3mm it still taps and holds threads with smaller bolt sizes. If you need larger bolts in places you can't reach back of then there's other quick and dirty ways like drilling larger hole and inserting a nut weld in place and grind flat.

So now go away and don't come back without pics of a welded frame. .

[grain_r]

Hey Jazz

You didn't say the frame had to be a CNC machine

thanks for the advice on the bolts. I like the idea of welding the nuts into the frame and grinding them. you say drill them but with my welding skills as they have been it will just be nice to fill some of those holes that just seem to appear in the metal when the tig torch is close. I have brought 2 boxes of screwfixes finest M5 Allen bolt selection boxes (And not even Christmas).

Thanks

Rob

[JAZZCNC]

you say drill them but with my welding skills as they have been it will just be nice to fill some of those holes that just seem to appear in the metal when the tig torch is close.

Tig.!! . . . You shouldn't be blowing holes with Tig.!! . . . It's like welding with chocolate sauce it's so smooth and controllable.!! . . . . Go watch a few more videos on setup. . Lol . . . .. Or try it with your eyes open this time. . .

Edit: Just seen pics and there spot on welds mate well done. Tig isn't easy thing to learn so your doing well. .

[cropwell]

Hi rob,
If you need larger bolts in places you can't reach back of then there's other quick and dirty ways like drilling larger hole and inserting a nut weld in place and grind flat.

Or use riv-nuts if you can't be arsed to fart about with welding

[JAZZCNC]

Or use riv-nuts if you can't be arsed to fart about with welding

Cum-on I'm a Yorkshire Man have you seen price of them buggers.!! . . . . . Can get 100 nuts for price 10 of them.!!

[grain_r]

Hey Jazz

Thanks for the kind message.I think its getting there but i don't always get the same results every time at the moment. but I absolutely love welding now it still amazes me. I want to be confident enough to weld some of the chassis on the car and not need to ask a friend it they might like a ride in it first (Just in-case ). I think because I'm teaching myself there is probably a lot of bad habits going to be there.

I did think if riv-nuts originally but it seems that if any vibration occurs then these would start to wonder about a little. I really love the idea of welding the nuts in. I'm a worrier and I have used the sander to take the zinc coating off but it says somewhere the gasses are pretty bad for you. I'm not sure if there are specific welding quality nuts around or anything ? or just hold my breath and grow a pair.

[JAZZCNC]

or just hold my breath and grow a pair.

None of the gases given off are exactly good for you so if welding for long time or anything you know isn't sweet smelling then wear a mask.! I wear mask all the time when welding.

[JAZZCNC]

. I started out wanting a welding trolley and what I have finished with is a welding go cart well al-right nearly finished.

Grass has nearly stopped growing so rip out the engine and throw it on the trolley and you'll have the CNC machine finished in no time. . . Lol