I had similar questions in this post. You should find everything there about how to calculate the size of the motors you need and the associated electronics. all nema 17 motors are NOT created the same! Good luck!by Trexation - Reprappers
Good luck! make sure to use a gfci plug, a ground wire, and a fuse / circuit breaker.by Trexation - Reprappers
Could I get a link to the page? you need to make sure that it can take a 12v input voltage and a 240v output voltage but otherwise it seems fine.by Trexation - Reprappers
My bed is about 12.75mm thick, but even still I would be interested in the thermal cutout guard you suggest. Do you have a link to one?by Trexation - Reprappers
Oh, I was thinking of my heater which is 6 Amps at 120v; It is less than an amp so a heat sink will not be necessary like dc42 said.by Trexation - Reprappers
How to wire an SSR ( Video ) I am currently in the process of setting up a mains voltage heated bed also, and there are a few safety feautres that I have found from my research that you are going to want. 1. A GFCI portable plug $15 Link to one 2. A switch of some kind, a normal light switch will do just make sure it is rated for 15 Amps 3. A fuse for about 2-3 Amps more than your heated bed draby Trexation - Reprappers
Could you return it? If you can return do return it. If you are not able to return it then, What voltage do you use in your area? 120v or 240? Are you confident working with AC power? If you have 240v power in your area then you could use an SSR to drive it at full power. If you have 120v power in your area then your heater's performance WILL be significantly degraded even with the use of an ssby Trexation - Reprappers
Quotecozmicray 45mm beams on a 225mm span? looks like build volume will only be 150 x 150 x 150 mm Why not a bigger build area? Will you be supporting a 1 ton extruder? A sturdy frame would allow it to print far faster and would allow the ability for easier transportation though it is a little overkill. 2020 would have worked about the same.by Trexation - Reprappers
Nice job! I enjoyed the video series.by Trexation - Reprappers
I find the results "good enough" for what I am doing with accuracy in the + or - .1mm which is pretty good IMO.by Trexation - Reprappers
QuoteDyze_Design Regarding the heatbed, is there a reason why you want to get such high power from 12V? Why not building something from AC instead of DC? I would agree with Dyze; AC is useful and with a well made ground wire and gfci plug you "Should" be fine. 35cm x 35cm = 1225cm2 1225cm2 x .5W per cm2 = 613W 613W / 12V = 51A (DC) 613W / 120V = 5.1A (AC)by Trexation - Reprappers
I actually made a printer very similar to what you are doing, I will post pics of how I set up the Z axis with a piece of 2in x2in x 1/8in aluminum angle bracket.by Trexation - Reprappers
Thanks for all the help! For stepper drivers I will probably just get DRV8825s and cool them as well as I possibly can.by Trexation - Mechanics
A 10 dollars a driver those are really expensive... At that point I would probably just buy this if I could connect it to my ramps... Would that be possible?by Trexation - Mechanics
Will running my motors at 3/4 of their rated current really be that bad? If I am able to achieve 65% of the 2.5A max rated current that DRV8825 would provide would be 1.625A My motors can handle 2A Thus 1.625A/2A = 81.3% of total possible current .813 * 84 oz-in = 68 oz-in max torque (4x the torque required) LOL, I could attach one of Link... I thinkby Trexation - Mechanics
Okay, I will keep that in mind and thanks for the help!by Trexation - Mechanics
Would DRV8825 Drivers be a better choice? They are rated for 2.5A compared to the 2A provided by my A4988. The Ebay Linkby Trexation - Mechanics
I think that I have finally found some decent stepper motors at this qMAAOSwu4BVn9gW" target="_blank" rel="nofollow">link, at $11.60 per stepper they are also not a bad price. Thanks for all the help digital dentist!by Trexation - Mechanics
So I tried out the oriental motor site, and here is what I got.. (See pictures below) it was about 32 oz-in of torque with a 2x safety factor.by Trexation - Mechanics
These are what you have in mind correct? qMAAOSwu4BVn9gW" target="_blank" rel="nofollow">Ebay and this Ebayby Trexation - Mechanics
Thanks for all of the support! I have calculated the torque that my stepper will need, here are my calculations and testing methodology. The Test - See the picture ( picture is before I removed motor resistance ) In short I used a clothes hangers as weights to determine the amount of force required The Math 6 Hangers * 8oz each1 = 48oz .479in diameter pulley * 48oz = 22.992oz-in 1. Based on tby Trexation - Mechanics
I have a dilemma. My Y Carriage is huge; I have a 8.5 pound (4~ kg) piece of aluminum tooling plate with a silicone heater, an under layer, and various linear motion components and fasteners. All in all I would guess it weights between 9 - 10 lbs. Moving the entire Y carriage on 4 cheap Chinese lm8uu bearings is a small single stack Nema 17 stepper with 36 oz-in of torque ( Ebay Page ). I have crby Trexation - Mechanics