Show all posts by user
Everybody here is a developer. Share what you are doing !
Re: Use precise Robot Arm to print big Part - 9 years ago
Nice design...best of luck with your efforts. Have you done any programming work on a parallel arm SCARA robot like the Morgan 3d printer?by simspeed - Developers
Re: Cheap FLIR (thermal camera) from China - 9 years ago
Here is one recommended to me....FLIR Camera for your phoneby simspeed - General
Re: Different way to fight inertial force?! - 9 years ago
Here's an interesting idea... 3d shock absorbersby simspeed - General
Re: New printer "Helga" - 9 years ago
Nice looking Honza...although it doesn't appear much different from most "cube" printers. Show some closer detail photos to explain how yours is different. Thanks...TPby simspeed - Developers
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
Very nice Jeff...very nice! So in this configuration are there Z limitations? Doesn't appear so depending on how much line you have spooled for the Z springs. What about the XY? Does that change much as the angle of the lines gets flatter as Z rises? What do you think the print area useful limits are? Great work...and fast execution of the rebuild!!by simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
Quoteo_lampe Let´s say the stepper turns clockwise and moves the red line 1 inch. The "rear" pivot point of the effector would lift 1 inch. But at the same time the red line would allow the front pivot point to drop 1 inch. The green line would have to lift 2 inches, to make both pivots of the effector lift 1 inch. Without extra spring force on the green line, the stepper movement would only mby simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
Yea, I wondered about that. As the effector rises or moves closer to the pulley pivot points the red lines will shorten as the green line lengthens but that's proportional for all three legs. The center pivot for the tension post doesn't change in relation to the effector. but I can't decide if the top of the post moves disproportional within the diameter of movement. I tend to think that it dby simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
Here is a representation of the cable routing for one leg. As the motor turns the effector and tension pole moves in conjunction with the other 2 legs throughout the desired path. Static line tension is created by having the tension pole length adjustable to put whatever load is necessary on the combined cables for all legs simultaneously. Mount the motor and pulleys at the base and top ofby simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
QuoteLoboCNC simspeed's thoughts on using synchromesh cable got me to thinking about this possible method for cabling up a Delta-T type printer. (BTW, the "T" is for tensegrity.) This configuration should give near constant downward force on the tension post independent of the Z height. Note you would need tandem synchromesh cables as each motor needs to drive 2 cables in parallel - I've justby simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
I see that you've obtained excellent results with the design you have now. I can appreciate that value considering the simplicity and relative low cost of your design. But as you've stated there are drawbacks in certain areas that would benefit the utility of the machine if they could be practically overcome. The suggestions I've made are of course just that....whether or not they would prove tby simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
Good idea Jeff, I'm planning to use CF springs to offset the weight for my X gantry (current build). The mass is still there of course but the motors won't have to support the weight and it won't fall in the event of power failure. Also...on your design, if you were to use equal weights for the pole and stepper motor pairs you would in effect create a CF spring condition because the two weighby simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
Quotesimspeed You could also use dead weights on string line to replace the rubber hose for tension on the center post. That way the tension would remain constant regardless of effector position. Suspend the weights in the support posts and run the string line over v-groove pulleys up to the top of the center post where you have the hose mounted now. The same could be true if you replaced theby simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
You could also use dead weights on string line to replace the rubber hose for tension on the center post. That way the tension would remain constant regardless of effector position. Suspend the weights in the support posts and run the string line over v-groove pulleys up to the top of the center post where you have the hose mounted now.by simspeed - General
Re: Chain and sprockets VS. belt and pulleys? - 9 years ago
SDP-SI carries synchromesh cables and pulleys in various pitch and pulley tooth count. I had 3DHubs print custom 15 tooth pulleys for my current project using this Thingiverse file synchromesh pulley but the pitch diameter didn't fit the cable when it arrived. The quality of the prints were also poor. I downloaded the CAD from from SDP-SI and created my own custom .stl file (different hub lenby simspeed - General
Re: Chain and sprockets VS. belt and pulleys? - 9 years ago
Take a look at synchromesh cables and plastic sprockets. Lightweight and relative inexpensive. Great tension strength and the ability to change directional routing without consequence. I'm using them on my current build and I've designed them into my upcoming Scara arm project.by simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
Excellent quality I'd say... Nice work indeed.by simspeed - General
Re: GIANT heated beds? - 9 years ago
That's FLIR camera is really cool. I'll have to think about getting one of those for my Nexus phone. I used 16ga. wire total length about 450 inches. I bought a big spool online for about $50. Got a Mager SSR for the control relay. I'll run it through a smoothie like the Dentist is doing. No blog yet but I'm planning for one when I'm finished with the build.by simspeed - General
Re: GIANT heated beds? - 9 years ago
My aluminum bed is 560 mm by 760 mm for a printer I'm building. I made it out of 8020 v-slot extrusions. I used ni-chrome wire looped inside to make the heater circuit. It heats to 110c using 120v mains power. I built it on a stainless steel kitchen cart. I'm having some bearing shaft parts made to tie the dual Nema 23 Z axis motors together for the Y gantry. I just finished tying the dualby simspeed - General
Re: GIANT heated beds? - 9 years ago
If you have a high temp heated enclosure....do you even need a heated bed. I had a few small ABS parts printed locally on a Stratasys printer and was surprised to see that the print bed plates are made from ABS. No heat bed but the enclosure is like a sealed oven. He said the plates are reusable for quite a number of prints and they only cost about $5 to replace.by simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
Loss of resolution as the Z lengthens is a deal breaker I'm guessing. Of course you can move the bed through the Z range and keep the print head in the sweet spot, but that adds costs and complexity to what now is a nice and simple printer. Still Jeff...I'd be interested in seeing what can be accomplished with your idea as it stands. Keep up the good work!by simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
I'd think about using a Hall sensor mounted to the top plate and a magnet or magnetic tape on the center pole for TDC location.by simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
Here's an even smaller pulley that's structured to work with your existing pins. Your point about the zero diameter pulley seems logical of course, but looking at the physical layout the pull is always consistent between the two transition points. Even if you had a large diameter pulley at each point the pull center line stays the same if the pivot stays the same at each end. Yes...?by simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
I'd be more inclined to use a base pivoting micro pulley machined out of Delrin or even aluminum. They make them pretty small. I'd think maybe a little heavier line too.by simspeed - General
Re: I need some 20x40mm extrusion cut - 9 years ago
Hi Greg....a 10" chop saw with an 80 or 90 tooth carbide blade will easily give you a clean sharp cut on the v-slot extrusions. The blades are expensive but necessary for clean cuts.by simspeed - Job Shop: I need stuff made!
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
I wonder what the life-cycle of the line will be at the effector wear points..?by simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
The E3D Cyclops has the filament feed offset at right angles to the print nozzle. So yes that approach does work. Also the CEL-Robox printer feeds the filament 90° to the nozzle. Lay the Cyclops on its side where the Bowden tubes feed horizonal to the bed; drill and tap the nozzle 90° to the stock location and set it all on a lower stage effector plate. Should work well.by simspeed - General
Re: New Delta Printer - Look Ma, no rails! - 9 years ago
Great effort Jeff....I'd like to see how a Bowden tube setup works and more details on your design....thanks!by simspeed - General
Re: Wiring Gauge - 9 years ago
Thanks for confirming amp drop for higher voltage Cdur... I located a spool of 18/4 control wire on Craigslist that I'm going to check out today. PVC semi-rigid sheathing so I'm not sure how flexible it is...but the price is right if it looks like it will work. The cable will run inside long aluminum extrusions so I ordered some of these connectors for quick disconnects. I like the function....by simspeed - General
Re: Wiring Gauge - 9 years ago
Hi raptor_demon...thanks for sharing your wiring setup. I like the idea of an inline fuse. My chassis mounted GFCI plug is 20 amp so I'm looking for that to act as my on-board fuse. I'll probably look for some silicone jacketed 18ga for the control circuits since I don't have any wire stock of my own. Thanks...by simspeed - General
Re: Wiring Gauge - 9 years ago
Thanks CDRU... I'm running a 24V PSU and the E3d Cyclops heat cartridge is 24V also. Should that take a lower gauge wire? I have long travel in every axis so will be using some form of cable chain to keep all the wiring tucked away. The 14 AWG power cord appears to have a natural 4" diameter to the loop end, so 16 or 18 AWG bundled wire running in the cable chain should reasonably be less donby simspeed - General