Show all posts by user
Designs that do not fit in other categories. Previously named "New RepStraps and Post Mendel"
Re: CoreXY 2:1 belt ratio double torque and resolution ? - 4 years ago
That's a lovely machine prot0typ1cal ! Do you have a video of it working I wonder ?by Pippy - CoreXY Machines
Re: CoreXY 2:1 belt ratio double torque and resolution ? - 4 years ago
You're most welcome Piper3d.by Pippy - CoreXY Machines
Re: CoreXY 2:1 belt ratio double torque and resolution ? - 4 years ago
Quotepiper3d Quoteshortyski13 How do you get .02mm? I get .08. Isn't it 2mmx16x(.9/360) It is niether 0.02 nor 0.08. 20 teeth x 2mm x 1.8/360 x 1/16= 0.0125 16 teeth x 2mm x 1.8/360 x 1/16= 0.01 We're not using 16 microstepping. Plus we're using 2:1 belt reduction - reduces the load on the motor and the belt.by Pippy - CoreXY Machines
Re: version 1.9 too slow - 4 years ago
The Marlin guys and gals over here might be interested in your findings and for sure should be able to help you .. Marlin peeps You'll need a github login username/pw (if you haven't already) to post in the issues section.by Pippy - Firmware - Marlin
Re: CoreXY 2:1 belt ratio double torque and resolution ? - 4 years ago
Quoteobelisk79 I'm just here to engage in a discussion as an enthusiast hoping to learn more and share ideas. I'm not here to say your design is dumb or pointless. That's nice of you obelisk, good on you Well, the idea's now there for anyone to try and play with. It's no bad thing to share these things. After all, it's where the fun does lay. Go forth and experiment I say ! Anyway, yes gearsby Pippy - CoreXY Machines
Re: Marlin 2.0.X > Setting output pins as open collector - 4 years ago
You could use an NPN (or N-channel MOSFET - better still) to provide open collector from any CPU output if need be. Scuse the quick and messy drawing ..by Pippy - Firmware - Marlin
Re: Wiring SD card reader to MKS 1.4 - 4 years ago
Also the SD card pins might need specifying if no display is specified in the config files ?by Pippy - Controllers
Re: CoreXY 2:1 belt ratio double torque and resolution ? - 4 years ago
Quoteobelisk79 Couldn't you just get some inexpensive brass gears and do the same thing that way with less cost and complexity? Gears add backlash if you're not careful, though you can remove the backlash with careful gear selection etc. We don't think adding 4 little pulleys is difficult or complicated, particularly if you're capable of building an entire printer. We're actually finding such rby Pippy - CoreXY Machines
Re: CoreXY 2:1 belt ratio double torque and resolution ? - 4 years ago
Quotedc42 QuotePippy I've been testing various combinations of microstepping and motor current etc, the one thing I found was motor stalling with 16 microstepping as compared to 4 microstepping at the same high speed setting, I had to go from 250mm/s (with 2:1 belt ratio) with 4 microstepping down to approx 220mm/s when using 16 microstepping to prevent motor stall. That's probably because yourby Pippy - CoreXY Machines
Re: CoreXY 2:1 belt ratio double torque and resolution ? - 5 years ago
Yes that's possible, though I don't think the middle pulleys in the OP are that difficult to add really. But in another design I have added an extra support bearing for the motor because I don't like having the constant sidewards force from a tensioned belt on the motor bearings and shaft alone. It's just a 5mm bore flange bearing. It doesn't remove the pressure from the motor bearings and shaby Pippy - CoreXY Machines
Re: CoreXY 2:1 belt ratio double torque and resolution ? - 5 years ago
Quotedc42An easier way to increase resolution (if you need to) is to use 0.9deg motors and 16-tooth motor pulleys. Moving to 16 tooth drive pulley would be nice because that produces 0.02mm per step rather than 0.025mm per step .. nice to have more rounded numbers, not that it makes any difference at that level with home built 3D printing really. The reason for me was mainly to reduce motor loaby Pippy - CoreXY Machines
Re: CoreXY 2:1 belt ratio double torque and resolution ? - 5 years ago
Quotethe_digital_dentist If you really want high resolution, and have deep pockets, you could use 5 phase steppers. They usually come in either 500 or 1000 full steps per rev. You can sometimes find surplus motors with matching drivers on ebay for <$100. You have to be careful if you get motors and drivers from different sources. Some motors are wired for "pentagon" drive, and some for staby Pippy - CoreXY Machines
Re: CoreXY 2:1 belt ratio double torque and resolution ? - 5 years ago
Quotedeckingman At the last count, my printer which now has 3 CoreXY gantries (one for the hot end, one for the 5 extruders and a third which acts as a load balancing/ force cancelling gantry) uses 60 sets of wheels which is 2 to 3 times what many people spend on a complete printer. That's a little out of my price range But I'd certainly like to try the V-slot and wheels method, I do like simpby Pippy - CoreXY Machines
Re: CoreXY 2:1 belt ratio double torque and resolution ? - 5 years ago
Quotedc42 QuotePippy I'm running the motors at 4 microstepping rather than the usual 16, as you get quite a bit more torque at lower microstepping it seems That's a myth. Going from full stepping to half stepping reduces torque (and motor heating). Increasing microstepping further doesn't reduce torque. I've been testing various combinations of microstepping and motor current etc, the one thinby Pippy - CoreXY Machines
Re: CoreXY 2:1 belt ratio double torque and resolution ? - 5 years ago
Quotedc42 An easier way to increase resolution (if you need to) is to use 0.9deg motors and 16-tooth motor pulleys. Yes probably easier, but it would mean buying new motors (extra cost), I have 1.8deg motors and 20-tooth pulleys to hand. Don't 0.9 deg motors have less torque and top speed than 1.8 deg motors ? .. I've not tested 0.9's so not sure, but curious.by Pippy - CoreXY Machines
Re: BigTreeTech SKR v1.3 - 5 years ago
QuoteRoberts_Clif OK! This is strange because it says on the link you posted QuoteTo build Marlin 2.0 you'll need Arduino IDE 1.9 or PlatformIO. We've posted detailed instructions on how to build Marlin 2.0 for ARM. Yes I know, though it might depend on what stepper motor drivers you use, I can't remember at the moment (not long woke up), but there was a reason why Arduino IDE couldn't be usedby Pippy - Controllers
Re: CoreXY 2:1 belt ratio double torque and resolution ? - 5 years ago
The 250mm/s is with 2:1 belt ratio, I forgot I'd calculated that WITH the 2:1 belt ratio change. I'm running the motors at 4 microstepping rather than the usual 16, as you get quite a bit more torque and top speed at lower microstepping it seems, plus it prevents Marlin from switching to double stepping, and the noise level is not really any different to 16 microstepping when using TMC drivers. Aby Pippy - CoreXY Machines
Re: BigTreeTech SKR v1.3 - 5 years ago
QuoteRoberts_Clif How would you setup Arduino 1.9.0 IDE to compile Marlin 2.0 for this controller. I would like to compile the firmware before buying the controller. You can't use the arduino IDE for this, you need to move to PlatformIO and Atom (or VSCode) to start playing with Marlin and this 32-bit board (and other 32-bit boards). Atom The arduino IDE was originally written for beginner stuby Pippy - Controllers
Re: CoreXY 2:1 belt ratio double torque and resolution ? - 5 years ago
No not really, just thinking of a smallish printer with finer steps and better acceleration. Just ideas at the moment. Seems a waste to have the ability to go fast with normal setup (say 250mm/sec with 20 tooth pulleys) and not really be able to use it, so why not reduce top speed by 2 with the added benefit of double the resolution and torque ?by Pippy - CoreXY Machines
Re: Nitro´s A.R.P.E.G. 230°C Chamber printer for PPSU - 5 years ago
Wow, congratulations ! Well deserved with that kind of engineering and imaginationby Pippy - General New Machines Topics
CoreXY 2:1 belt ratio double torque and resolution ? - 5 years ago
Would adding the four middle pulleys double the torque and resolution ?by Pippy - CoreXY Machines
Re: Do not leave hairspray on your glass bed too long... - 5 years ago
Maybe if it happens again, heat the bed up to soften the part to try and pry it off, simply to get it off the bed without causing possible harm to the bed ? If it still won't come off, turn the bed temp right up and cut your losses with a melted lumpby Pippy - Printing
I'm not a bot, honest - 5 years ago
Sometimes when I post a post on here (not very often), it tells me I'm a bot, and tell me I can't post the message, yet when I go back and look at the thread it has infact posted the message ? I don't think I am bot, but then, who knows what we 'really' are in the grand scheme of things, eh Anyway, I wonder why it do say I'm a bot when I aren't a bot when I press the send but' ? hmmmby Pippy - General
Re: Some "serious" laser-marking with a fiber-laser ... - 5 years ago
Good god, 200 euros for a little piezo motor lol. A bit out of my price range. I've used lasers in my designs for ranging and Mbit data linking, but have yet to venture into the high power (high for me) cutting world, which I'd really like too. Those ones you have look expensive Viktor. What's the metal box I wonder ? .. is that the laser, or maybe the piezo driver(s) ?by Pippy - Laser Cutter Working Group
Re: Some "serious" laser-marking with a fiber-laser ... - 5 years ago
Would be fascinated to see some detailed photos of the guiding mechanics (the micro motors ?), see how you've done it.by Pippy - Laser Cutter Working Group
Re: Some "serious" laser-marking with a fiber-laser ... - 5 years ago
200 Watts is a LOT of power! Where do you get your lasers I wonder ? I'm not sure if even a 20 Watt laser diode would get past customs in the UK, don't really know.by Pippy - Laser Cutter Working Group
Re: Some "serious" laser-marking with a fiber-laser ... - 5 years ago
That's a nice and extremely useful tool you haveby Pippy - Laser Cutter Working Group
Re: Some "serious" laser-marking with a fiber-laser ... - 5 years ago
In that case, I guess you could cut through thicker brass, say 1mm, just that you'd need many more passes ? or would the focus point and/or beam shape prevent cutting through thicker material ? What frequency is the laser (Co2, ultra violet etc) ?by Pippy - Laser Cutter Working Group
Re: Some "serious" laser-marking with a fiber-laser ... - 5 years ago
I wonder what power you use to cut through brass, and is it a Co2 laser ?by Pippy - Laser Cutter Working Group