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09-05-2020 #11
-I believe for a beginner is more difficult to mount properly the rails on the gantry if they are not on one plane, precision wise
-its ugly the motors to be at the front, put them at the back
-100x100x3 is well enough for the base
-invert that motor on the Z so it's not so ugly sticking up, also all would look more compact
-This machine looks much like my first build combined with Deans Gantry design, so you can check how i made the z and maybe all the build log, furthermore i have the plans in sketchup for free
-invest in a proper straight edge and save on that epoxy, by just shimming the rails. Long ago when was making mine 1st build, i was insisting on the epoxy and wondering why Dean shims the rails, now i know, 200e in my pocket. i would buy calibrated steel bar say 40x6mm and epoxy that precisely to the frame and mount rails on top of ut
-check the Youtube video of that one i am talking about https://www.youtube.com/watch?v=C9hT...ature=youtu.be
-for a serious Z axis you would like to move the rails not the bearing carriages, furthermore overhang should be as minimal as possible and that a key in for a perfect finish on metal.
-servos are 10x upgrade over steppers IMO, go for it, 2:3 is the correct ratio for such machine, 400w 230VAC
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09-05-2020 #12
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09-05-2020 #13
Don't confuse the Panasonic Servo's Boyans using with the cheap Chinese versions, they are completely different animals.
https://www.aliexpress.com/item/3279...66606f37xA9hrK-use common sense, if you lack it, there is no software to help that.
Email: [email protected]
Web site: www.jazzcnc.co.uk
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09-05-2020 #14
I would like to challenge this claim a little bit: The spindle motor is as stiff as its axis, bearings and housing. Take the allowed clamping area of the spindle motor, which is usually 150mm. Add the tool length and tool holder length to that, and you will have a 200mm gantry clearance, if the spindle is clamped in the spindle bracket at its highest allowed point. This means that you can have a short front plate, only as long and wide as you want to space the carriages. What becomes critical here is how you design the upper part of the rear plate. This design needs to be stiff when machining with the Z-axis raised up high.
In the end, rails on the front plate will be stiffer and will allow a greater gantry clearance. But if 200mm gantry clearance is enough for you, then I think the design I have described is better.
Skickat från min SM-A530F via TapatalkLast edited by NordicCnc; 09-05-2020 at 10:19 PM.
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09-05-2020 #15
I agree 100% and having built them both ways I know this to be true. The difference between them is so negligible it doesn't matter in all but the hardest materials which typical routers are NOT designed to cut. There are many other areas which could be improved or done that would have a much bigger effect.
-use common sense, if you lack it, there is no software to help that.
Email: [email protected]
Web site: www.jazzcnc.co.uk
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10-05-2020 #16
While what you say is true for a short to normal Z travel, when the rails are on the front Z moving plate there are a couple major benefits:
- the overhang of is considerably smaller, like 5cm or more
- the rails themselves strengthen the plate
- the whole spindle body strengthens the plate if clamped with 2 clamps at all extension length
- once you have the design for 200mm you can easily change it for 300 or more mm Z travel
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10-05-2020 #17
Details and notation of my Z axis if you have recommandation to improve stiffness, reduce the cost, facilitate assembly or the tuning...
Spindle dimensions correspond to the JGD-80 2.2kw 80mm from http://www.jian-ken.com/,
Last edited by Gustave; 10-05-2020 at 02:35 PM.
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11-05-2020 #18
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11-05-2020 #19
Hi,
I have 90x180mm aluminium profil for the gantry and I am not sure on using one or combine two as L-shape as I plan previously with the 80x120mm section. The gantry is 1450mm width. What do you think about it ? bellow some sketchLast edited by Gustave; 14-07-2020 at 07:39 PM.
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14-07-2020 #20
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