Lathe bed welding casting

Welded steel is actually quite good for damping and rigidity. There are some particular joints that enhance damping too. I have a paper on the design techniques somewhere. Casting in polymer concrete can also add damping. Wrapping a core in stick-on rubber, sliding it into your main weldmemt, and injecting epoxy into the gap gives you VERY high damping.

Laser or plasma cut steel parts can align themselves and save a LOT of work!

Scraping steel is kind of a pain. Slower than cast iron, for sure. But, do-able.

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Bolted joints have better damping than welded.

Damping added as outlined above seems like a good alternative.

Residual stress from welding seems like a big enemy of machine tools. I’d want to stress relieve any weldment.
 
I am loking for materials. mainly steel. I read that weldment nee to be form low carbon steel content so guys are using st37 is s235 and st52 is s355. This two candidate are sutable. Tehy say that strees reliving isnt mandatory, they only put linear rails on it. I dout it.

Eny sugestion about the steel to use.

Welding with MIG type welding 0.8 wire or 1.0mm perhaps i can find 1.6mm macine. Biger is beter yes?

Polimere concrete link

Stres reliving is a must i think. Does enbody know what kind of thiknes of steel plate i need 10, 15 or 20 mm. Probably tehr eneed to be minimum thiknes that weldment wont bend or somthing.

Then i need to mill it.

And then i need to grind it too.

Doens enbody know hot to put linear guides to the weldment. I was helping soem service men when we service cnc centers, if i remember corectly al linear guides are screwed down and from the side there are some inserts witch push linear rail from the side. Is this a must.
 
Stress relief is a "nice to have", not a "must have"
If you have a way to get it uniformly hot, do it. Nuke it with a weed burner torch well above boiling water and slow cool could be useful. Otherwise, don't worry about it...

Of course, I probably shouldn't give advice on my second margarita [emoji6]

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Does enbody know where to get eny books about velded machine bed.
I am thinking ot weld machne bed from multiple tetrahedron elements.
I got one book, if sobody know where to lookfor it wodu realy nice.
One company manufactured lathes in US from weldments. Does enbody know wehre to get eny plans shemes form it.

thanks
 
Do you have a copy of Machinery's Handbook?

books.industrialpress.com

Machinery's Handbook - Industrial Press

Machinery's Handbook, 32nd Edition, Print & Digital (also see Combination Packages below) Companion Guides & Collector's Edition Combination
books.industrialpress.com books.industrialpress.com

It will give you many formulas and tables that may be helpful for what you're trying to achieve. I doubt you will find one book that can instruct you on how to build a machine tool from fabricated steel though.

John
 
Thanks.

I have talekd to service man in who repair our machiners. He was stuned. He said no no no nobady use cast iron eny more. al machines are welded period. Some are difrent, but big machines arent made with casting eny more to exspencive. He mentioned that soem amchine can be mate of otehr materials but cast iron is not the thing eny more.

So system closed.

I will contact china casting company lec see what the price is for casting bed. I try to mill lathe bed ways to fix linear rail onto them disaster. dont eve try it.

Today i wwent to scrap yard i saw big machine form welded steel cosntruction, cast iron nowere to be found,.. only steel period.
only steel it is industry machine bir router type for wood procesing like 8 meter in lenght and about 3 meter in height and 3 in width.

So nexst stop is sampling ideas or testing.

thanks
 
I talked to bigest cast company in country. They said mould is costing 2000 to 7000 euro and then casting per kilo is 4 euro . So if we loking lathe bed of 250 kilograms then it is 1000 euro. So i can get for 250 euro metal for welding from store thrue one guy i know. Sooo... 1 euro epr kilo. It seams we gona weld this suker.
 
Have eybody eny idea what steel to use to build welded lath bed. And it woud be nice to know shoud be this welded with electrode or with mig procedure. If i udnerstnad corectly mig with c02 has narower seting parameter gap as co2 nad argon adn it penetrates more deply into metal to fuse it. I do mic but with co2 and arogn mixsture dont ahve eny exsperiance with co2 thoue. As electrode is concerned it si mor eused for construction becose it has more ductile weld as mig procedure. So if enyone can shed soem light on this oen woud ebe nice.

thanks
 
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