Material choices - help needed!

[stevehales]

Hi guys,

I'm in need of some help deciding which material to buy for some projects. I've used 50mm square hollow section (3mm wall) in the past but I think it might not be up to the job this time. I'll be buying it to use for several projects and some structures will involve cantilever type situations. So:

1. I was wondering if going up in wall thickness (to 4mm) would allow it to resist bending better, or should I go to rectangular hollow section? For the same wall thickness, is 60x40mm any stronger than 50x50mm when used the right way up?

2. Ideally I'd use 50x75mm but its not widely available, would 40x80 be a good substitute? I don't really want to go up to 50x100, its just too big for most of what I need.

3. Can anyone recommend any sizes of steel they would ALWAYS keep handy in their workshop?


Thanks in advance,

Steve.

 

[the snooper]

people will want to know what you are making before they offer any advice i would think

 

[s410man]

Hi guys,

I'm in need of some help deciding which material to buy for some projects. I've used 50mm square hollow section (3mm wall) in the past but I think it might not be up to the job this time. I'll be buying it to use for several projects and some structures will involve cantilever type situations. So:

1. I was wondering if going up in wall thickness (to 4mm) would allow it to resist bending better, or should I go to rectangular hollow section? For the same wall thickness, is 60x40mm any stronger than 50x50mm when used the right way up?

2. Ideally I'd use 50x75mm but its not widely available, would 40x80 be a good substitute? I don't really want to go up to 50x100, its just too big for most of what I need.

3. Can anyone recommend any sizes of steel they would ALWAYS keep handy in their workshop?


Thanks in advance,

Steve.

can you be more specific

some projects covers anything from a boat to a tea coaser

cantilever designs-what size strenght weight is needed

if you know that 50 by 100 is to big why cant you just go down a size

you seem to know what you want already

thanks

 

[s410man]

to slow

 

[the snooper]

to slow

can happen to any of us

 

[stevehales]

Sorry, I did mean to add a list of projects:

Welding trolley/cart to hold a MIG & ARC set along with 1 or 2 10L bottles
Workbench modifications
Engine stand for rover V8
Small workshop hoist - 250 to 500kg load with about a 1M reach

I'm sure other ideas will come to me. And yes, I know some of those things will be cheaper to buy, but I like the challenge of making them to my own spec.

Cheers,

Steve.

 

[the snooper]

50mm x 50mm box is a little over the top for a welding trolley cheaper in 1 inch box

 

[s410man]

Sorry, I did mean to add a list of projects:

Welding trolley/cart to hold a MIG & ARC set along with 1 or 2 10L bottles
Workbench modifications
Engine stand for rover V8
Small workshop hoist - 250 to 500kg load with about a 1M reach

I'm sure other ideas will come to me. And yes, I know some of those things will be cheaper to buy, but I like the challenge of making them to my own spec.

Cheers,

Steve.

20 or 25mm box 2 or 3mm wall
depends what modifications- a shelf to hold a pen or new worktop to hold a rover v8
possibly angle-50mm may be enough i would think
a rectangular section is most suitable for this-it needs to be strong enough not to bend sideways but not to strong wherease the up/down part needs to be considerably stronger

thanks

 

[s410man]

Hi guys,

1. I was wondering if going up in wall thickness (to 4mm) would allow it to resist bending better, or should I go to rectangular hollow section? For the same wall thickness, is 60x40mm any stronger than 50x50mm when used the right way up?



Steve.

yes for an engine hoist as the sideways load will not be as much but i would suggest slighlty bigger or thicker steel as you want to keep the ram point as far back as possible for more space

thanks