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IndustryArena Forum > MetalWorking Machines > CNC "do-it-yourself" > Advice needed for parts selection for new DIY CNC Mill
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  1. #301
    Join Date
    Jan 2023
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    436

    Re: Advice needed for parts selection for new DIY CNC Mill

    Quote Originally Posted by pippin88 View Post
    They are not listed, just message Fred via BST Automation on aliexpress.

    I got 30mm roller rails
    RG30-680mm 2pcs
    RGH30HA-ZA 4pcs
    USD490.00 including shipping by Fedex.
    that's a good price, If I get that directly from hiwin its €788.72. BST will be a good source if guys at tnkbearing.en.alibaba.com don't deliver.

  2. #302
    Join Date
    Nov 2013
    Posts
    4282

    Re: Advice needed for parts selection for new DIY CNC Mill

    Hi pippin,

    I scored a precision granite frame to use as my machine base - this has set the size of certain things and enforced a moving gantry design (thus needing two 800mm travel screws).
    Yeah, that is a problem. If you have a fixed size then second hand or new old stock becomes too patchy to be useful.

    Craig

  3. #303
    Join Date
    Jun 2023
    Posts
    136

    Re: Advice needed for parts selection for new DIY CNC Mill

    Mineral castings.The standard to measure the static characteristics of machine tool bed and other components is usually the rigidity of materials, that is, the minimum deformation under load. Under the same weight, the rigidity of iron castings is the same as that of mineral castings without considering the influence of shape.

  4. #304
    Join Date
    Jun 2023
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    136

    Re: Advice needed for parts selection for new DIY CNC Mill

    Quote Originally Posted by peteeng View Post
    Hi Sus - Here's my current router build, its Called Frankie. Its footprint is 1200x1200mm its envelope is X740mm Y890mm and Z310mm. It has a 24000rpm 800W water cooled spindle. Its made from plywood and aluminium. Z is all steel. Its a precurser to a UHPC cast mill. I'm happy with the build and most of its aspects. The base and gantry will be cold cast, the saddle maybe. I have sent some material samples to a lab for modulus/strength testing and that will determine the final materials. It cuts aluminium easily so I imagine yours will too. My mill is required because the things I want to make (cnc machine parts, gantries, saddles and bases) are composite; carbon fibre and fibreglass and other materials. The machinists I use for various bits won't let these materials near their mills so I have to build a wet mill suitable. So all the plywood you see in this image will become engineering grout (a type of concrete) or will be epoxy mineral cast. Results available soon... So I don't want to machine steel but I have spent a lot of time looking at the spindles for both and its a hard thing to sort. The 100m/min surface speed is the limiting factor for steel.... Peter
    Quote Originally Posted by ardenum2 View Post
    Diamant's website says it works with :

    BEIJER OY

    Elannontie 5
    01510 VANTAA, Uusimaa
    +358961520550

    [email protected]

    maybe you can get it from them. If not. I'd find research papers about it, they usually give full recipes and results, a good starting point and better than walking blind.

    Nice to meet everyone.
    If you need mineral castings.You can contact me, my email:[email protected]
    I'm from China,My company has produced a lot of products, small can reach 100KG, large can do 46 tons.
    My English is very average and I don't know how to upload photos. Very reason to share my product with you.

  5. #305
    Join Date
    Sep 2016
    Posts
    351

    Re: Advice needed for parts selection for new DIY CNC Mill

    Quote Originally Posted by pippin88 View Post
    BST Automation can now get Hiwin RG (Roller) rails.
    I just got a set through them.

    (Couple of years ago when I asked, they were not selling the RG series).
    I contacted BST Automation as well as Ball screw support,Ball screw nut bracket,Motor bracket,Coupling,Round linear guide-Well Precision Machinery Co.,Limited for linear rails and ball screws.
    For me both seem dodgy. Both claim that HIWIN linear rail blocks do not have the accuracy level printed. The guy from Ball screw support,Ball screw nut bracket,Motor bracket,Coupling,Round linear guide-Well Precision Machinery Co.,Limited even told me that both C and H accuracy levels are same.
    The actual photos shared by BST Automation does not have them printed. On the other hand, I have a couple of genuine(?) blocks I bought from Moore international in UK for a higher price which has the accuracy level printed as H.
    Also, many of the e-bay sellers listings also show accuracy levels printed. For example:
    https://www.ebay.co.uk/itm/225571854...IAAOSwZT1kW4ai

    Back to square one

  6. #306
    Join Date
    Jan 2008
    Posts
    1523

    Re: Advice needed for parts selection for new DIY CNC Mill

    Photo of your block please
    7xCNC.com - CNC info for the minilathe (7x10, 7x12, 7x14, 7x16)

  7. #307
    Join Date
    Sep 2016
    Posts
    351

    Re: Advice needed for parts selection for new DIY CNC Mill

    Quote Originally Posted by Mr-MaW View Post
    Nice to meet everyone.
    If you need mineral castings.You can contact me, my email:[email protected]
    I'm from China,My company has produced a lot of products, small can reach 100KG, large can do 46 tons.
    My English is very average and I don't know how to upload photos. Very reason to share my product with you.
    Hi MaW
    Do you manufacture machine frames with epoxy? If so where can I find more information?
    Thanks
    Sus

  8. #308
    Join Date
    Sep 2016
    Posts
    351

    Re: Advice needed for parts selection for new DIY CNC Mill

    Quote Originally Posted by pippin88 View Post
    Photo of your block please
    Please check here.
    https://ae02.alicdn.com/kf/Af826fce1...c38349550F.jpg

  9. #309
    Join Date
    Jun 2023
    Posts
    136

    Re: Advice needed for parts selection for new DIY CNC Mill

    Quote Originally Posted by suspension View Post
    Hi MaW
    Do you manufacture machine frames with epoxy? If so where can I find more information?
    Thanks
    Sus
    my email
    What products you need to do, you can go here to find it,https://grabcad.com/library/ma-miner...inear-motors-1

    Forgive my poor English,I do not register the website in English.So what you need to know, you can email directly.I will get back to you as soon as possible.

  10. #310
    Join Date
    Sep 2016
    Posts
    351

    Re: Advice needed for parts selection for new DIY CNC Mill

    I am about to put an order for many things such as spindle, servos, etc from china very soon. I got some quotes from alibaba for T-slot tables (700mm X 300mm X 50mm) with 6 X 14 sized T slots. Prices range from 450-500 for cast iron and around 100 more for steel. They say things are prcise to around .01 for 1000 mm. Steel used is Q235. I am thinking of ordering a steel one, but just wanted to see if there are things that I need to be aware of before ordering.

  11. #311
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    Sep 2016
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    351

    Re: Advice needed for parts selection for new DIY CNC Mill

    I was shopping for some steel plates today to get some idea about the cost.
    What type of steel should I be using for plates in the casting where rails, motors, bearing are attached. Mild steel? High carbon steel? Die steel? Stainless steel (304)?

  12. #312
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    Jul 2018
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    6252

    Re: Advice needed for parts selection for new DIY CNC Mill

    Hi Sus - Out of your list Mild Steel is fine. If you don't want it to rust S304 is good but more $$$ for material and harder to machine. Die steel and high carbon steel no need for the higher properties or cost. Peter

  13. #313
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    Jan 2023
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    436

    Re: Advice needed for parts selection for new DIY CNC Mill

    back when I was considering long steel bars for the rails I was to use Steel 1.0038 / S235JR, its cheap and its the steel used for square pipes so I wanted to use the same steel for everything. When it comes to stainless in germany we have two most popular designations V2A and V4A. V2A is a CrNi and V4A is a CrNiMo steel. the cheaper V2A should suffice for anything related to rails.

    V2A are 1.4301, 1.4541 and 1.4307
    V4A are 1.4401, 1.4571 and 1.4404.

    Stainless Steel 304 / 1.4301 / X5CrNi18.10 Pete mentioned is also the most popular V2A.

  14. #314
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    Nov 2013
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    4282

    Re: Advice needed for parts selection for new DIY CNC Mill

    Hi,
    mild steel, anything else is a waste.

    When I was a lad my grandfather would point to a piece of steel to be used in the next project and declare ' that is 90 ton axle steel'....like its the best steel in the world. He was referring to
    hardened and tempered 4340. It has a tensile strength of 180ksi, and hence the 90 ton moniker, and is as tough as hell. Its still my go to steel when I need somthing tough and strong.

    Ordinary mild steel has a tensile strength of 60ksi, so 1/3 that of 4340.....but it has the same Youngs modulus. This I still find counterintuitive but a steel which is three times
    stronger but is the same stiffness.

    When designing and building CNC machines the stresses are a vanishingly small percentage of the tensile strength of a material....we use big thick sections not for strength but
    for stiffness. If you want to build a stiff machine then mild steel is just as good as a through hardened chrome-moly steel like 4340.

    If you need a strong steel because of local forces like a high tensile thread or a gear or a highly loaded axle then 4140 is a nice step up from mild steel, and if your serious about strength then 4340, thereafter
    you are into tool steels and you'll have to harden them.....not really a hobbyists procedure.

    Craig

  15. #315
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    Sep 2016
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    351

    Re: Advice needed for parts selection for new DIY CNC Mill

    Thanks all! I am very much relieved now. Apart from mild steel, all other steel I checked are extremely expensive! High carbon steel is manageable if really needed. Mild steel is pretty cheap.

    I have a concern about Mild steel's tendency for it to get corroded when exposed to water. Given that I will be using water for cooling while cutting, how do you handle that. I was told by the steel vendor that Mild steel and high carbon steel can get corroded.

    Also, is cast iron a good choice for the T-table?

  16. #316
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    Jul 2018
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    6252

    Re: Advice needed for parts selection for new DIY CNC Mill

    Hi Sus - 1) you can paint the surface any colour you like. Polka dots are popular around here 2) I have used this sort of product for machine bits and car panels in the past 3) Parkerising and blackening are possible as well they usually need a bath but I'm sure there's products out there that are brushable. Peter

    https://boatcraft.com.au/information...o_mc1_info.php

    https://janekits.com.au/product-cate...el-blackening/

  17. #317
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    Jul 2018
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    6252

    Re: Advice needed for parts selection for new DIY CNC Mill

    Hi - Metal stiffness and strength are not related. Metals consist of many many grains held together with either friction or intergranular materials. The stiffness of the material is how the bulk material behaves when strained. The strength of a metal, say the yeild or proof strength is the strain at which the grains start to slip over each other. So the strength of a metal is how good the grains are held together whereas the stiffness is how the bulk material behaves.

    take an aluminium pot, its nearly pure aluminium. Its Youngs modulus is the same as 7075-T6 material. But the 1000 alloy has a YS<50MPa whereas the 7075-T6 is over 500MPa. So if you load two identical beams, one 1000 and 0one 7075 they will both deflect the same until a certain load then the 1000 series will yield. The 7075 beam will yeild at 500/50=10x that load. 7075-T6 is a zinc alloy that has been solution heat treated to homogonise the mix, then quenched to freeze the mix, then aged to harden the billet. The hardening is various interalloys filling in the grain boundaries and gluing the grains together hence its high strength. When initially refined aluminium was more expensive than gold and it was used for cutlery by Royalty. Now we chuck it in the bin.... Peter

  18. #318
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    Nov 2013
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    4282

    Re: Advice needed for parts selection for new DIY CNC Mill

    Hi,

    I have a concern about Mild steel's tendency for it to get corroded when exposed to water. Given that I will be using water for cooling while cutting, how do you handle that.
    If your really concerned just paint or treat with a tannate......but are your sure you need to?. I use flood coolant all the time, on every job other than a PCB, and none of the steel or cast iron is painted
    or in anyway treated and it might get a rusty sheen, but that's about it. Worry about important stuff, not whether it will rust.

    Craig

  19. #319
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    Re: Advice needed for parts selection for new DIY CNC Mill

    Hi,
    grey cast iron has a Youngs modulus of 110GPa, various SG grades of cast iron have a Youngs modulus of 170GPa and steel has a modulus of 205GPa.

    For a fixed and given size section steel will be stiffer than SG, and that will be stiffer than grey iron.

    If designing a part you'll already know how stiff you want the part to be so you'd make a steel part with a certain thickness, and slighter thicker for SG and thicker again for grey iron.
    The thickness is approximately proportional to the cube root of the modulus ratio.

    steel 205GPa thickness T
    SG Iron 170GPa
    (205/170)1/3 . T = 1.06 T
    Grey Iron 110GPa
    (205/110)1/3 .T= 1.36 T

    So despite grey cast iron only being half as stiff as steel it requires 36% greater thickness to match a steel part. Note these are 'seat of the pants' calculations, not the sort that you use for design,
    but just to give you a feel for the scale of the problem.

    Provided you are not constrained by dimension or weight then either cast iron or steel can be used. Cast iron has nice vibration damping properties which is a bonus, and of course if you are casting
    then you get the exact shape and size you require. You can of course cast steel but its expensive, you've got into hard mold territory, and that costs bigtime. Other than that you have to construct steel
    by welding which requires heat treating thereafter.

    Craig

  20. #320
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    Re: Advice needed for parts selection for new DIY CNC Mill

    Hi,
    if you use a water soluble oil in the coolant it pretty much eliminates rust......of course the best corrosion inhibitor is whale snot.

    A friend of mine lives it Kiakoura and whales live there year round and there is a thriving business taking tourists out to see them. The whales get pissed off and hoink
    up great big gobs of snot, and Roger collects it. Win...win!!

    Craig

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