Maybe this one in a 160:1 ratio. Could be used with a 1 - 2 KW servo motor and give the needed torque. Harmonic gear reducer / hollow-shaft / high-precision / electrical for servo motors - RITM IndustryRITM Industry
After a lot of research, I found this actuator reference from Nabtesco:
https://precision.nabtesco.com/en/products/detail/AF-N
So it's a geared servo motor, they even mention the Tube bender use case in the doc so I guess it should work.
So I asked a quotation for the following 2 models:
- AF042N126 (A6_1kW) with a rated torque of 412N and speed of 15rpm
- AF080N129 (A6_2kW) with a rated torque of 784N and speed of 15rpm
The problem is I don't know yet the price but I already know that I will have to wait 1 or 2 months as the local distributor doesn't have it in stock.
So I would be very interested to have a plan B, like maybe with a gear and servo separated.
Like a Mitsubishi one for the Servomotor as it seems easier to find where I am, but then come the gearbox where I don't know much about it...
I guess there is the formula to calculated the rated torque of a servo + gear reducer?
Or if anyone know some suitable references, I would be very interested.
Thank you very much
Maybe this one in a 160:1 ratio. Could be used with a 1 - 2 KW servo motor and give the needed torque. Harmonic gear reducer / hollow-shaft / high-precision / electrical for servo motors - RITM IndustryRITM Industry
Jim Dawson
Sandy, Oregon, USA
You should make sure that you are sitting down when you receive the quote for a harmonic drive of the correct size. However, you can buy pre-owned examples from ebay dealers in South Korea and China. The prices are still significant but still quite a bit less than a new one.
Looks as if a 45 or 50 size drive would be required. https://www.harmonicdrive.net/produc...-units/shg-2uh
Most of these cnc benders use internal mandrels to stop the tube collapsing. Basing it on a basic Baileigh(?) machine doesn't sound like the greatest idea.
at the begining I wanted to reuse the dies from my manual bender but no way it's not gonna be possible, so it's ok I will draw it and there is a workshop near my house that can machine it.
What I'm designing now is a CNC mandrel bender,
So for now I think the most suitable i found is this geared servo from Nabtesco but as i was saying earlier I gonna have to wait 1 or 2 months once it will be ordered and i still didn't receive the price:I already solved the problem of feeding part (Z-axis) that is going to be ensured by a rack and pinion and 2 guide way from Hiwin, and the rotation of the tube, it's basically a rotary chuck that have 2 servos, one to control the opening and closing of the chuck and one to control the rotation of the tube.
now I'm starting the bending part, the bending will be a bending arm bolted on the geared servo motor, and the clamping system will be on this arm made of a linear actuator using a servo that will push the clamping die.
Then will come the controlling part and it's gonna use some Arduino based PLC.
https://precision.nabtesco.com/en/products/detail/AF-N
So I'm looking for alternative
I also saw this:
http://www.apexdyna.co.th/index.php?...e&Id=539968170
but I'm not sure if it suitable, I'm trying to look at what is available here in Thailand, so there is principally Japanese, Taiwanese brand but I really have no clue about gears...
Did this CNC Bender ever happen?
United States Patent 5,862,697
Electric CNC Tube Bender. That's my name on it.
All the big-name CNC bender manufacturers now make 100% electric CNC benders. I started the whole thing but was never really a fan. Much prefer the hybrid approach.
There has been mention of proportional valves; not strictly necessary. Take a bang-bang (directional valve) with DC coils and PWM the coils. Horrendous deadband/hysteresis but if one has control of the PID, this is easily compensated for. When forming a tube, the bend-arm only needs to hit a target.
Distance Between Bends (DBB) is the Y axis
Plane Of Bend (POB) is the B axis
Degree OF Bend (DOB) is the C axis
And this is how a CNC tube bender is programmed - Lengths, Rotations, Angles. No G-Code involved.
It's a real shame that nothing came of this project
Regards,
Craig