Home › Forums › TinyG › TinyG Support › Electronics Shopping List Approval Needed
- This topic has 6 replies, 3 voices, and was last updated 10 years, 5 months ago by spoonr778.
-
AuthorPosts
-
May 30, 2014 at 11:37 am #6027spoonr778Member
I am building a large CNC for Plywood and maybe Aluminium if it works. (1.8×1.5m – effective 1.5x1m) Got the frame all sorted, now I only need the electronics.
Controller: TinyG V8
Motors:
http://www.ebay.de/itm/German-Ship-Promote-3-pcs-Nema-23-Stepper-Motor-3A-425-oz-4leads-dual-shaft-/281295712688?pt=Motoren_Getriebe&hash=item417e87f1b0
Plus one extra for dual gantry drive.Drive: Lead Screw
1. Does this combination work? Do you think its powerful enough?
2. Which power supply would you recommend?
3. Does my computer need to be connected while cutting?
May 30, 2014 at 2:20 pm #6030cmcgrath5035ModeratorI have no applicable experience with lead screw machines, but would offer the following comments.
Question1 – Not clear what you are using for a spindle. You’ll need a lot of torque to make cutting speed in plywood, for sure in Al. Torque generally translates to mass, which raises the question of strength of the X Axis cross member.
Questions2 – Your description translates to likely long runs due to relatively slow lead crew movement, for sure in AL. Longs runs translate to potential heat build-up in the drivers. I have seen references suggesting that higher voltage (I believe it is 36V max) is better under high load conditions. I’d search about, hopefully someone with applicable experience will stop by and comment. Be mindful of your thermal design.
Question3 – Yes, some form of computer will be required to continuously stream the GCode. TinyG has a limited code buffer.
Sounds very interesting, be sure to post a picture when you are done!
- This reply was modified 10 years, 5 months ago by cmcgrath5035.
May 30, 2014 at 2:37 pm #6033spoonr778MemberI meant torque to move the axis not for the spindle. The axis are very strong and rigid. Will the steppers be powerful enough with the given current to drive the axis?
Thermal control shouldn’t be a problem. I plan to measure the stepper temperature during use and maybe will add mini fans.
May 30, 2014 at 3:56 pm #6038cmcgrath5035ModeratorSpindle; I don’t think my machine is in your league, but find the DW660(my spindle) to be a relatively large mass for the X Servo to control. It also puts a good twist load on the axis member, but you seem to have that covered. If you had an even larger router, controlling/moving that mass could be a challenge, mitigated of course by the torque gain inherent in the screw based design.
Stepper power – that will depend a lot on your stepper to lead screw ratio, or do the steppers directly drive them? And, obviously, the efficiency of / drag on the screws from the movable elements.
Thermal – actually, I was worried more about tinyG thermal management.
May 30, 2014 at 5:15 pm #6039mcgyvrMemberyeah hard to answer any of those questions with the details provided.
but yes you will ABSOLUTELY need a fan to blow on the tinyg board with 4 x Nema23 @ 3A..(50+ cfm blowing directly on the bottom)
May 30, 2014 at 7:26 pm #6040spoonr778MemberThe router is a big woodworking router. It weighs 3.5kg. So its quite heavy. If I can’t cut aluminum, so be it. I would only work on palm size pieces anyway. But would be nice to have the ability. Main use will by plywood.
The leads crew will be this one. I´ll make some anti backlash nuts from Delrin. The steppers will be directly connected.
http://hfbshop.de/product_info.php?info=p3003_trapezgewindespindel-2000mm-rechts-tsr-tr12x2.html
So it all comes down to: Have the steppers got enough torq with the current provided from the board without extra stepper drivers. (4x drivers add quite a bit to the costs.)
May 30, 2014 at 7:44 pm #6045spoonr778Memberhttp://imgur.com/XiTfKPG I took the 222N from a CNC forum which is a guestimate that other people use.
According to this, one motor will not be enough. I could use 2 Nema 24s for the Y-Axis (left + right) And then Nema 34s for the X and Z axis with separate drivers right?
-
AuthorPosts
- You must be logged in to reply to this topic.