Thread: 1200mmX900mmX170mm 4axis cnc
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04-05-2017 #2
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05-05-2017 #3
Hi, May I ask what rails/tracks/guides you are using and what is the method of attachment? What do you want to cut?
The span of the section is where you need to pay attention. Mass/stiffness can be your friend.
Welding can be you enemy with shrinkage and distortion. The 50 x50 x3 might be used for bracing , but the main rail support might be stiffer with 75 X 50 X 5.0 RHS.
Tool load and weight of the material you are cutting will also dictate frame material properties. Sorry not many answers and a lot of questions.
Paul
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05-05-2017 #4
Hi Paul, thanks for your participation to this thread.
Rails I am planing to use HIWI linear square rails, attached with screws .
I am planning to cut wood mainly and I will be glad if the machine can cut aluminum also,I know that I can not have a cnc that can do both works well, so the main purpose is to build a cnc foe woodworking-guitar building.
Thanks for the input about the main rails, i will use it at my upgrate workbench design.Last edited by Nickhofen; 09-05-2017 at 03:58 PM.
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05-05-2017 #5
I have a lot to learn....
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10-05-2017 #6
Is there a reason not to go with that design on the bench?I mean the lower section for the 4 th axis? The bench will have a movable section at the one end that will cover the 4th axis and when is needed I will remove that part so I can machine big parts that are going to be heleded at the A axis.
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26-05-2017 #7
Bump.....!!!!!
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12-01-2018 #8
You will probably dislike my advice ..
Which is unfortunate, since it is excellent and will help You a lot.
All, absolutely all cnc and mills/routers/machines depend on rigidity.
A common error using linear guides is comparing the max strength of a linear guide to actual work, or load.
A typical old manual lathe, 11-12", has 50 metric tons "strength".
But cutting loads are 50-100 kgf.
The reality is that modern machine tools are about 2% loaded at max vs strength.
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The Following User Says Thank You to hanermo2 For This Useful Post:
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12-01-2018 #9
Thanks for the advice Hanermo2!
What do you suggest me to do ?
Hola to Sevilla ,Malaga,Barchelona....I can't recall other cities I have visited,it's been a long time.
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17-01-2018 #10
Hi nickofen !
*Everything* depends on your goals ..
and capacity and productivity depend on rigidity above all else.
Ex.
I could cut about 0.1-0.2 mm deep with a typical setup, using a 50 mm wide 4 insert apkt facemill.
(12" Lathe, upgraded ac servo spindle 2.5 kW continuous.)
I built a modular vice using 4 pieces of 50x100-300 mm solid tool steel billets, cross-drilled for 16 mm hardened industrial grade 12.8 bolts.
Vice took 3-4 days to do, and the 4 parts mass == 50 kg.
I could then cut the same piece, about 200x200x80 mm, with 3.4 mm deep cuts at double the rpm.
The difference in productivity is about 10:1 - 20:1.
I donīt think there is a "right" answer, but vastly bigger and heavier and thicker is usually the right choice for *everything* in lathes and mills and routers.
They deliver about 20x the performance, typically for 100-150€ more in steel costs and 2 days extra work in assembly work and fitup, per assy.
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