New Boy introduction

[mekanik]

Frame looks solid, don't like the large box section you are intending for the gantry, better to have two square sections welded together, did you look at AVOR.
Regards
Mike

[Crunch]

Frame looks solid, don't like the large box section you are intending for the gantry, better to have two square sections welded together, did you look at AVOR.
Regards
Mike

Hi Mike
I had planned the side braces very similar to avor's design , don't you like the box section for looks or strength.
I based my idea around the attached image, but to sit the gantry on a plate then on the cars as avor's design with end braces like avor.

Thanks Paul

[mekanik]

Hi Paul
Nothing to do with cosmetics, two square sections welded together will be far more rigid than a similar size one piece component.so you can have it looking as per the shop sabre but it will be more rigid, just pointed you to AVOR as others have commented on the gantry design and though you might find it appealing.
Regards
Mike

[Crunch]

Hi Paul
Nothing to do with cosmetics, two square sections welded together will be far more rigid than a similar size one piece component.so you can have it looking as per the shop sabre but it will be more rigid, just pointed you to AVOR as others have commented on the gantry design and though you might find it appealing.
Regards
Mike

Hi Mike
Thank you for your time , I read the Avor build which was very detailed, Any help or advice is greatly appreciated. This is all new to me and I'm happy to be advised, shown different methods etc,
I spent a lot of time looking and reading to choose a design that will fit my needs and fit the garage space. This is why I joined this forum for advice from the people who have been there and done it.
I would like to use the box steel if possible just because I've paid for it, even if I had to weld some braces inside to strengthen it. I would be willing to change it if it was needed.

Regards Paul

[Crunch]

I have a few questions, if this is not the right place to ask please advise where to post.

What is an acceptable weight of a gantry with every thing on it including spindle, it terms of performance, I understand the heavier it gets the more effort it takes to start and stop it when moving due to the mass. Do you just deal with the extra weight with gearing or bigger steppers? Or is there a sweet spot in weight ?

I'm not 100% sure on how the axis are, as some machine I've seen shows front to back as x axis and others machines x axis is left to right.

Also which ball screws would be best to use,
2 x 900mm 1605 or 1610 with pulleys y axis. ( front to back ) or
2 x 900mm 2005 or 2010 with pulleys y axis. ( front to back ) would you get whip on this length and would these be better with a heavier gantry?
1 x 1200mm 2005 or 2010 with pulleys on x axis ( left to right ) again for whip due to length .
I've based axis direction on most machine I've seen are this way, but there are many that show they are the other way.
Which is correct ?
Do you know why different machines show different ways ?

Regards Paul

[mekanik]

Hi Paul
Others (who have actually built a machine) would be better to give advice regarding gantry weight ect, but as you say you want it as rigid as possible and also not too heavy.As a general rule the axis are usually X longest Y gantry and Z for the virtical. our cousins from across the pond sometimes do it differently, it,s a pitty you didn't open a discusion before you started your build as if you are strugling with floor space you had the option of making a semi vertical layout.
Good luck on whatever you decide, under no circumstances purchase any of your electrical gear before you have your design set, the weight of the gantry is an important factor regarding motor choice, and it would be better for you offer your design up for critique, the lads will put you right regarding motor selection.
As you want to use the box section you have already purchased for the gantry i would do as you said and put a length of flat bar inside across the narrow section, drill a series of holes in the box section and stitch it to the flatbar so get the same effact as two square sections, won't be as rigid as the latter but should be better than the box section as it is now.
Regards
Mike

[Crunch]

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