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Re:trapezoidal screws or ball screws? (0 viewing) 
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TOPIC: Re:trapezoidal screws or ball screws?
#1933
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trapezoidal screws or ball screws? 3 Months, 2 Weeks ago Karma: 0  
Hi,

I need advice on the two types and also what screw diameter I should use for a strong enough torque to mill copper. I was thinking a diameter of 20mm for x and y axis and a 16mm for the z axis? also correlating to that, what size should i machine the feeding bit on the screw for what size of coupler? is there a relation to the diameters chosen of the screws or does it solely depend on the ID of the hole of the coupler? any help would be highly appreciated!

philipp
 
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#1941
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Re:trapezoidal screws or ball screws? 3 Months, 2 Weeks ago Karma: 0  
TRAPESIODAL SCREW IS SELF LOCKING, THEREFORE HOLDING TORQUE IS NOT BE VERY HIGH , BUT THERE IS A PROBLEM WITH BACKLASH , IT IS A LITTLE BIT DIFICCULT TO ACHIEVED A SATISFIED AND LONG LASTING (WITHOUT ADJUSTMENS) CONSTANT ZERO BACKLASH . ON THE OTHER WAY THE BALL SCREWS IS NOT SELF LOCKING , THEREFORE SERVO OR STEP MOTOR NEED A BIGGER HOLDING TORQUE , BUT BALL SCREW NUT - ROD IST ALWAYS WITH ZERO BACKLASH (TEORETICLY BACLLASH IS 0,0) AND THEY NOT NEED ADJUSTMENS . , BUT THE PRICE FOR BALL SCREWS IS ALCO HIGHER THEH TRAPEZIODAL . DIAMETER FOR YOUR NEEDS I CAN NOT RECOMENDED BECAUSE I DO NOT NOW HOW BIG MASCHINE WOUD YOU MAKE AND HOW BIR MOTORS DO YOU HAVE . BUT , I BUILD A CNC ROUTER WITH 1,0 M X 1,0 M AND I USE BALL SCREWS L -1100 MM WITH DIAMETER 16 X 5 AND WORKS VERY WELL .
 
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#1942
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Re:trapezoidal screws or ball screws? 3 Months, 2 Weeks ago Karma: 0  
sweet! thanks a lot for your reply. that really helped a lot. I was going to build a ­frame­ that is 840x840 with aluminium extrusion in the size of 45mmx90mm (L or S, I don't know yet). So, do you think 16mm ball screw will do, or is 20mm better to be on the safe side when milling soft ­meta­ls? motors, I was thinking about a dual motor set up (left and right side of the ­base­ ­frame­ for the x axis, maybe 200-300ozin each? an a 400ozin motor for y? do you think those are good choices? not sure what motor I am going to use for the z axis yet. Cheers!
 
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#1943
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Re:trapezoidal screws or ball screws? 3 Months, 2 Weeks ago Karma: 0  
FOR YOUR CNC ROUTER IS VERY GOOD CHOISE BALL NUT AND ROD WITH DIAMETER 16 MM AND 5 MM STEP . MY MOTO IS "THE BIG IS NEVER TOO BIG BUT SMALL IS EVER TO SMALL" , THEREFORE MY SUGESTTUION IS TO TAKE A 400 OZIN (2,5 NM) MOTORS AND IF YOU HAVE POSSIBILITY BY ALL 4 MOTORS THE SOME TORGUE / MODDEL . THEN YOU AVOID PROBLEMS WITH MOTOR DRIVERS CONFIGURATIONS . SIMPLY , ALL DRIVER HAVE SAME CONFIGURATION .
 
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#1946
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Re:trapezoidal screws or ball screws? 3 Months, 2 Weeks ago Karma: 0  
Yeah true, I was thinking of buying the same motors, but then I thought in terms of dual motor set-up on the ­base­ that if i put 2x400ozin on x and 400ozin on y then I have a lot more torque on x but less on y, so y becomes the limiting factor. if i use 2x400ozin on x do they not add up in power? so doesn't it become 800ozin? thats why i thought 2x200ozin on x each side for good and stable movement and 1x400ozin on y. not sure I thought energies, just like volts add up? cheers!
 
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