Brainstorming Specifications.
Setting this discussion up to gather up and brainstorm ideas.
LIST OF EQUIPMENT AND MATERIALS UNDER CONSIDERATION:
Motors/Controllers:
- cadcamcadcam.com (servo motors and controller)
- 3-axis Stepper Motor System based on DQ542MA, on Ebay
- 6-axis Stepper Motor System based on DQ542MA, on Ebay
- DC1 Servo Motor Controller, from Makerbot
- Spindle Motor Controller (Super PID)
- Cheap source of motor encoders
- Brushless DC Motor Controller from Jameco
- NANOTEC, yet another closed loop control, but this one has all comp...
- NANOTEC NEMA size equivalents
- PD2 is Nema 17
PD4 is Nema 23
PD6 is Nema 34
- SuperTech Complete 3-axis Servo System
- A 3-axis Servo Kit Make in Canada
- Nice Low Cost Servo Board(UHU)
- http://www.xylotex.com/ (stepper system)
- Spindle motor candidate from SCIPLUS
Materials to be Used:
- Steel Bed?
- Aluminium Bed?
- Wooden Bed?
Some design considerations:
- What weight for the whole machine?
- What size the bed?
- Fixed sized gantry with customizable length?
- Dremel adapter for light work?
Everyone feel free to inject any comments. This is your chance to provide input on what features go into the DIYDrones CNC Machine!
Current Bed Size:
Currently we're thinking the bed size will be 18x24 inches.
Insights from bGatti:
Some observations I can offer from experience:
1. Inexpensive skate bearing are not well sealed, and will likely stick if exposed to wood dust.
2. The most vibration on my machine is twist across the gantry - so make the gantry height ~twice the height of the lower extremity (from the table).
3. Parallel ports are increasingly harder to find - especially on laptops.
4. It doesn't take a lot of power to move a cnc machine - you will probably want to turn down the power to avoid breaking bits / bending the spindle shaft anyway - so don't specify a motor system which is stronger than your specified spindle. Anything which can be cut quickly on a strong machine, can be cut slowly on a lesser machine. $1000 is a lesser machine.
5. I have a wooden bed; I'd love an aluminum bed, but with $1000 to spend, the wooden bed isn't my biggest challenge. (It's gantry twist and probably runout for PCB Boards).
6. 3D printers want speed more than brute rigidity - most blogs on the subject of hybrids concede this point - which said - there are many parts which can be made slowly - but some parts call for a flying buttress - which does depend on a certain rate of speed.
- Attachments:
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BOM-UHU.xls, 25 KB -
BOM-UHU.txt, 2 KB -
BOMUHU_Dkey.xls, 62 KB
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Replies to This Discussion
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Permalink Reply by Ellison Chan on -
Ruwan, looks like the Nanotech. I wonder if their a distributor, marking up the price.
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ModeratorPermalink Reply by Ruwan on -
Actually, http://www.musclecorp.com/english/ is the manufacturer. We bought it from http://www.coolmuscle.com (i.e. http://myostat.ca/Coolmuscle) distributor.
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ModeratorPermalink Reply by Ruwan on -
One year ago, when I bought it, it was $495 for one motor. We need to buy the power supply and cables separately. Cable selection depends on the communication interface we are going to use.
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Permalink Reply by Ellison Chan on
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Well, this motor from Nanotec is 102.90 € for single quantities.
It's also a 24V, with integrated controller.
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ModeratorPermalink Reply by Ruwan on -
Yup price looks good.. I believe CM1 price is high since it is a servo.
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Permalink Reply by Ellison Chan on
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The Nanotec above is also a servo.
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ModeratorPermalink Reply by Ruwan on -
I believe it is a stepper.. "PD2-O41 Plug & Drive stepper motor with integrated control and RS485-/CANopen Interface"
May be a wrong link or so?
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ModeratorPermalink Reply by Ruwan on -
I found another site which sell this for $580. http://www.automation4less.com/store/proddetail.asp?prod=CM1-C-23L20A
I'm sure, the first link I provided should cost less.
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Permalink Reply by Ellison Chan on
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Yep steppers with decoders. Better than plain DC motors, IMO.
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Permalink Reply by bGatti on -
I have an aluminum frame CNC with Xlinx drivers in the 18x24 size range / ESC Dremel Spindle.
We also have a home-built (wood frame) CNC machine which is built up like this from skate bearings at our Hackerspace (Charlotte HSC)
Some observations I can offer from experience:
1. Inexpensive skate bearing are not well sealed, and will likely stick if exposed to wood dust.
2. The most vibration on my machine is twist across the gantry - so make the gantry height ~twice the height of the lower extremity (from the table).
3. Parallel ports are increasingly harder to find - especially on laptops.
4. It doesn't take a lot of power to move a cnc machine - you will probably want to turn down the power to avoid breaking bits / bending the spindle shaft anyway - so don't specify a motor system which is stronger than your specified spindle. Anything which can be cut quickly on a strong machine, can be cut slowly on a lesser machine. $1000 is a lesser machine.
5. I have a wooden bed; I'd love an aluminum bed, but with $1000 to spend, the wooden bed isn't my biggest challenge. (It's gantry twist and probably runout for PCB Boards).
6. 3D printers want speed more than brute rigidity - most blogs on the subject of hybrids concede this point - which said - there are many parts which can be made slowly - but some parts call for a flying buttress - which does depend on a certain rate of speed.
Good luck.
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