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by AndrewRutter
Fri Mar 18, 2016 11:56 am
Forum: Mods
Topic: Dual Winchester Extruder Setup
Replies: 10
Views: 1822

Re: Dual Winchester Extruder Setup

No problem.

I hope it doesn't hold you back from figuring out a solution, Yours is a novel design and the RUMBA and the PSU could both drive the second heater without issues.

I can provide schematics if you need them (the boards are open, we have just never published them).
by AndrewRutter
Fri Mar 18, 2016 11:20 am
Forum: Mods
Topic: Dual Winchester Extruder Setup
Replies: 10
Views: 1822

Re: Dual Winchester Extruder Setup

Impressive. Some information you need to know: The second E socket is the one right below the first one. The AUX is the SL socket facing downwards. The AUX socket includes a GND pin, (its the square pad, closest to the back of the machine). You currently have the heater connected to that GND, which ...
by AndrewRutter
Thu Jun 05, 2014 3:04 pm
Forum: Mods
Topic: Signal to the E-Motor/Feed Motor
Replies: 3
Views: 1580

Re: Signal to the E-Motor/Feed Motor

There are high end stepper drivers that allow both digital current control and sensor-less missed step detection. Those 2 could be combined to give some crude feedback. The better solution is to use servo drive, and by creating a lookup table showing output speed for a given duty cycle, you can buil...
by AndrewRutter
Wed May 14, 2014 5:33 pm
Forum: Series 1
Topic: vertical pattern.
Replies: 43
Views: 6578

Re: vertical pattern.

Increase the pinchwheel pressure, unfortunately. I'm already using Caleb's pinch wheel strengthener, so I'm unsure how it works. Maybe someone has a suggestion for tubing that would work better - I think mine is PTFE, but I can check. Steve The tube will cause binding unless its fixed at both ends....
by AndrewRutter
Wed May 14, 2014 11:06 am
Forum: Series 1
Topic: Octoprint: Sometimes UI goes funny
Replies: 5
Views: 927

Re: Octoprint: Sometimes UI goes funny

Try turning off the G-Code visualizer (if you have it running), it seems to crash most browsers quite a lot.
by AndrewRutter
Sat Apr 19, 2014 4:43 pm
Forum: General Discussion
Topic: Hotend Safety.
Replies: 9
Views: 5473

Re: Hotend Safety.

Our current best idea, and currently in development, is using thermal fuses. These would be in series, integral to the heater leads, and spec'd to fuse when the hotend reached a high enough temperature to experience a failure of the thermal insulator. I will post more data and images when we have th...
by AndrewRutter
Sat Apr 19, 2014 4:40 pm
Forum: General Discussion
Topic: Hotend Safety.
Replies: 9
Views: 5473

Re: Hotend Safety.

Our requirements so far are:

The fail-safe must be integral (not removable without disabling the hotend).

It must be wired in series with the heater.

It must use standard industrial solutions.

It must not interfere with normal operation of the hotend.

It must be robust.
by AndrewRutter
Sat Apr 19, 2014 4:36 pm
Forum: General Discussion
Topic: Hotend Safety.
Replies: 9
Views: 5473

Hotend Safety.

As some of you are probably already aware, the style of hotend that we have been using from the beginning here at Type A Machines has some limitations. One of these is down to the use of a plastic thermal insulator. This can melt if the hotend gets too hot. There are several ways in which a hotend c...
by AndrewRutter
Thu Mar 13, 2014 1:32 pm
Forum: Series 1
Topic: Build platform hump
Replies: 11
Views: 2407

Re: Build platform hump

Ok, so it sounds like there are 2 issues. Firstly I think you mean you are trying to level the platform to actual 'level' not square to the gantry? Its a very very common miss-understanding because we call it leveling (its actually tramming, to be technical). its also possible its a bow in the X rai...
by AndrewRutter
Mon Mar 10, 2014 4:16 pm
Forum: Series 1
Topic: Build platform hump
Replies: 11
Views: 2407

Re: Build platform hump

Can you clarify?

You have a measurable dip in the Y axis, relative to a true plane? Not in the X and not just a linear error from front to back or vise/versa?

And if so, by how much?

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