modify ramps 1.4 to make it more reliable ? March 28, 2015 11:51AM |
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Re: modify ramps 1.4 to make it more reliable ? March 28, 2015 01:00PM |
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Re: modify ramps 1.4 to make it more reliable ? March 29, 2015 06:52AM |
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Re: modify ramps 1.4 to make it more reliable ? March 29, 2015 07:09AM |
Registered: 10 years ago Posts: 977 |
Quote
Dust
also dont buy a $7 china ramps with 5amp connectors on the 11amp side!
Re: modify ramps 1.4 to make it more reliable ? March 30, 2015 09:51AM |
Registered: 11 years ago Posts: 869 |
The FCI connectors (the green ones) are only rated at 12 amps. Now that's the rated current. I run my heated bed at 15 amps without issue. But there's probably a reason why the connectors are rated at what they are.Quote
AndrewBCN
They come with screw terminals that - if properly tightened - will not overheat. Of course if you want to avoid any problems with the screw terminals you are always free to solder the wires for the heatbed directly to the RAMPS PCB.
Re: modify ramps 1.4 to make it more reliable ? March 30, 2015 11:33AM |
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Re: modify ramps 1.4 to make it more reliable ? March 30, 2015 01:49PM |
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Re: modify ramps 1.4 to make it more reliable ? April 02, 2015 08:31PM |
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Re: modify ramps 1.4 to make it more reliable ? April 03, 2015 07:31AM |
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Re: modify ramps 1.4 to make it more reliable ? April 03, 2015 10:37AM |
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Re: modify ramps 1.4 to make it more reliable ? April 04, 2015 12:35AM |
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Re: modify ramps 1.4 to make it more reliable ? April 04, 2015 05:35AM |
Registered: 10 years ago Posts: 893 |
Quote
Dust
But it very evident there is zero qc.
Re: modify ramps 1.4 to make it more reliable ? April 04, 2015 10:24PM |
Registered: 10 years ago Posts: 977 |
Quote
Dust
at AndrewBCN
its not a myth
clasic eg for a cheap ramps....
Do you see the issue?
The owner tells me it did work fine after fixing this issue. But it very evident there is zero qc.
Re: modify ramps 1.4 to make it more reliable ? April 05, 2015 06:13AM |
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Re: modify ramps 1.4 to make it more reliable ? April 05, 2015 07:02AM |
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Re: modify ramps 1.4 to make it more reliable ? April 05, 2015 10:38AM |
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Re: modify ramps 1.4 to make it more reliable ? April 06, 2015 09:29AM |
Registered: 11 years ago Posts: 869 |
And now your price just doubled plus you need to redesign the board to make room for your voltage regulator circuit. I'm not saying that your changes aren't desirable or not upgrades over the original design. Rather there is a reason why it's the most popular electronics choice. It's easy to manufacturer with commodity parts, it's proven even with it's flaws, and most likely most important, it's cheap.Quote
Dust
Whats needed
Better connectors all over, locking and impossable to plug in backwards and over spec
Higher spec mosfets
Replace polyfuses with car type fuses
35v caps under pololu drivers so board will support 24v (some do this already)
Thicker tracks to all mosfets and their power connector to support more current.
Replace D1 with a 8-10volt voltage regulator (so no matter if you use 12v or 24v the mega still gets a nice safe 10v), and a jumper so you can still disable it
And If your really keen replace microstepping jumpers with a dip switches.
Re: modify ramps 1.4 to make it more reliable ? April 06, 2015 11:07PM |
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Re: modify ramps 1.4 to make it more reliable ? April 07, 2015 06:03AM |
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Re: modify ramps 1.4 to make it more reliable ? April 07, 2015 06:13AM |
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Re: modify ramps 1.4 to make it more reliable ? April 07, 2015 12:25PM |
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Re: modify ramps 1.4 to make it more reliable ? April 07, 2015 01:42PM |
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Re: modify ramps 1.4 to make it more reliable ? April 07, 2015 03:39PM |
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Re: modify ramps 1.4 to make it more reliable ? April 07, 2015 04:17PM |
Registered: 10 years ago Posts: 977 |
Quote
str8up
AndrewBCN
You are right about most people may not notice this and for the most part it will never be a problem. For me, if I buy something that has options - I want the options. The way I caught this was removing the jumper and measuring across the pins - should have read open. The reason I was trying different step rates was that I have older 0.9 deg. steppers and was trying to get a quieter operation. I had also upgraded the Pololu drivers from A4988 to DRV8825 which went to 32 micro steps.
Re: modify ramps 1.4 to make it more reliable ? April 07, 2015 05:39PM |
Registered: 11 years ago Posts: 869 |
If you go with the idea that everyone would want 1/16 microstepping, bridging the pins with the trace would be cheaper than having to install header pins and supply jumpers. As the copper is removed during etching, there is zero additional cost to leave the trace but then it forces 1/16 microstepping. It's possible Board House A produced a kabillion boards for Assembler A with the trace knowing they were 1/16th only, but then sold a surplus supply to Assembler B who didn't know it.Quote
AndrewBCN
I am trying to think of a possible explanation for the manufacturer of the PCB to have added these shorting islands but in the end I just think it is an error by the PCB (re)designer who just did not understand the purpose of these jumpers. Sometimes people have a hard time even doing a straightforward copy-and-paste...
Re: modify ramps 1.4 to make it more reliable ? April 07, 2015 08:11PM |
Registered: 10 years ago Posts: 977 |
Quote
cdru
If you go with the idea that everyone would want 1/16 microstepping, bridging the pins with the trace would be cheaper than having to install header pins and supply jumpers. As the copper is removed during etching, there is zero additional cost to leave the trace but then it forces 1/16 microstepping. It's possible Board House A produced a kabillion boards for Assembler A with the trace knowing they were 1/16th only, but then sold a surplus supply to Assembler B who didn't know it.Quote
AndrewBCN
I am trying to think of a possible explanation for the manufacturer of the PCB to have added these shorting islands but in the end I just think it is an error by the PCB (re)designer who just did not understand the purpose of these jumpers. Sometimes people have a hard time even doing a straightforward copy-and-paste...
Re: modify ramps 1.4 to make it more reliable ? May 29, 2015 01:59AM |
Registered: 11 years ago Posts: 11 |
Re: modify ramps 1.4 to make it more reliable ? May 29, 2015 06:54AM |
Registered: 10 years ago Posts: 977 |
Quote
nitewing76
...
And for micro-stepping, do not forget you loose torque. I think it was nopehead (HydraRaptor) that wrote a blog with the details.
Re: modify ramps 1.4 to make it more reliable ? October 19, 2015 04:08AM |
Registered: 12 years ago Posts: 423 |
Quote
str8up
Thanks Dust -
This isn't a case of sloppy solder bridging. This board has no indication of poor workmanship. The board worked just fine except the steps can not be changed. I'm going to try and attach some pictures. This post is FYI incase someone else is experiencing an issue with trying to change their step rates.
Later
Re: modify ramps 1.4 to make it more reliable ? October 20, 2015 05:44AM |
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