Hi John S & JazzCNC
You guys have got me going now and its late (got work tomorrow :cry: ) but I have revised the drawings with your suggestions in mind... its begiining to take shape and make sense.
I bought 500mm long 2" aluminium round bar from ASC wolverhampton branch and paid £34 for it. AW price £62 for 2000mm long. So much overpriced. As an addition it was the worse piece of metal I've ever had .Totally un-machinable. Still have this piece of c.... in a garage.
It was first and last time I bought from them. :cry: Very disappointed
Thou I prefer customers don't have cause to complain in the first place I much prefer customers to complain in a polite manner rather than not so I can give a replacement has well as highlighting any potential problems which then get corrected.
[QUOTE=JAZZCNC;26511 Like I tell my customers If you don't tell me about problems I can't fix them.!
Thou I prefer customers don't have cause to complain in the first place I much prefer customers to complain in a polite manner rather than not so I can give a replacement has well as highlighting any potential problems which then get corrected.[/QUOTE]
You're absolutely right. Like your approach.
The fact is I, as a customer agreed to pay this price (mostly bcos of unawareness of market prices) so there is no reason for price promise return. I used a bit of it, turning it first. If I wanted to knit aluminium jumper swarf would be perfect for this purpose.
Then I broke few 2mm drill bits trying to drill it -different speeds, feeds various lubricants then gave up. When making my timing pulley video (drilling way) I used free-cuting ally- no probs at all.
Anyway I'll keep it in any case- may be useful some day.
Next time I'll check prices first before making any hasty shopping. Just didn't expected price to be so sky-high-different than from other suppliers.
Like I said to John-S I've found with larger metal suppliers like ASC that if your not a company or don't buy on regular basis in decent Qty's they load the price.!
Fortunatly I am Vat registered and thou my main business hisn't engineering related I do get away with out price loading for awhile but because I don't buy often it soon starts to creep up.!! . . . I don't mind paying slightly higher prices for smaller qty's or tariff Qty based charging but it should stay constant at least.!. . . This piss's me off.
Thanks Jonathan for the additional comments and feedback. More than 1 person saying the same thing is always encouraging!
I am pretty much committed down the existing gantry route because I already have the ballscrews in hand and can't afford to buy anymore at the moment. My earliests thoughts on this was a metal version of the twin ballscrew- belt drive Solsylva design. I accept that the machine may have some limitations with aluminium milling but as this is a tertiary requirement, then I can live with that compromise for now. Wood, GRP, Plastic and CFRP are the priority at this time, hence the size of the machine in the Y axis. I am looking to source aluminium toolplate (6082 T6) and have found a reasonably priced source in Milton Keynes (MetalFast) but that was awhile ago so I will need to recheck.
The Following User Says Thank You to Jonathan For This Useful Post:
Things like gantry sides and general end plates or bearing brackets, motor mounts etc can be got from cheaper flat bar stock, still 6082 T6 just not machined perfectly flat.
The wider width's of flat plate stock can some times come slightly cupped but for none critical stuff or if machining several parts or brackets out of the width then it's not really a problem. . . Often just a quick surface will take away any cup. . . .Thou I must say the last few 300mm wide lengths I've had to deal with have been quite bad. The one I'm using at the moment is particulerly bad and if it wasn't for the fact I was cutting it up into smaller components then it would have been going back.!!
The Following User Says Thank You to JAZZCNC For This Useful Post:
Mikey now Knowing a bit more about your plans to use a single screw and looking at your design again then I think you may want to reconsider the width of the gantry and make the bearing spacing wider.! . . .That looks awfull narrow for a single ballscrew design making racking a big possibilty.? . . .How wide is it.?
Thanks for the tip on using the toolplate in the accuracy-critical areas - should save costs
Last edited by MikeyC38; 29-12-2011 at 02:19 PM. Reason: added revised drawings
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