Thread: Definately a scrapyard challenge
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07-01-2012 #31
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.
BruceThe more I know, I know, I know the less. (John Owen)
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07-01-2012 #32
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.
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08-01-2012 #33
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.The more I know, I know, I know the less. (John Owen)
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08-01-2012 #34
See your mum was right? there was reason why she said to eat up your weetabix in the morning:whistling:
If the nagging gets really bad......Get a bigger shed:naughty:
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08-01-2012 #35
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08-01-2012 #36
Cereal packet - Weetabix........Bruce
If the nagging gets really bad......Get a bigger shed:naughty:
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08-01-2012 #37
Dear mum, bless her
The more I know, I know, I know the less. (John Owen)
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08-01-2012 #38
Just ordered my spindle and inverter. Made an offer of £140 instead of £172 and it was accepted:dance: Other than postage that makes it the same price as a Kress. Bargain.
Now off to redesign the gantry.
BruceThe more I know, I know, I know the less. (John Owen)
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08-01-2012 #39
Yup
Here is the item no. 190618666009
There are more to be had
BruceThe more I know, I know, I know the less. (John Owen)
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08-01-2012 #40
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