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How to determine specs on a used machine?

Posted by WillAdams 
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WillAdams
How to determine specs on a used machine?
June 16, 2014 11:45AM
I've just received an Ordbot. It would have been put together almost 2 years ago.

The person who sent it to me referred me to this page: [www.makergear.com]

How can I tell what size filament it takes, what size the nozzle is, and what thermistor value I should use to commission it?

Edited 1 time(s). Last edit at 06/16/2014 11:46AM by WillAdams.
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Ralph.Hilton
Re: How to determine specs on a used machine?
June 16, 2014 02:31PM
Ask the vendor?
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WillAdams
Re: How to determine specs on a used machine?
June 16, 2014 08:49PM
I did, he's trying to look up the information --- as I noted, the machine was assembled almost two years ago --- so I'm trying to prepare a fall-back plan just-in-case.
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madmike8
Re: How to determine specs on a used machine?
June 16, 2014 11:11PM
Well, they made them both for 3mm and 1.75mm. Maybe you can measure the feed hole at the top of the hotend to determine is 3mm filament would fit.
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WillAdams
Re: How to determine specs on a used machine?
June 17, 2014 10:45PM
Here's a photograph of the hole for the filament --- I'm guessing 3mm?


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A2
Re: How to determine specs on a used machine?
June 18, 2014 05:14AM
Place a drill bit into the hole to help gauge the diameter. You should also purchase calipers, you're going to need it for calibration.
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WillAdams
Re: How to determine specs on a used machine?
June 18, 2014 08:07AM
I have a set of calipers.

Let's turn this around --- what is the diameter of the hole in relation to the diameter of the filament?

I'm guessing this extruder is set up for 3mm filament, since a #28 index drill (0.128"/3.25mm) drops all the way down.

Now I just need to puzzle out nozzle diameter and thermistor...

Thanks!
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madmike8
Re: How to determine specs on a used machine?
June 18, 2014 05:35PM
Unfortunately they seemed to offer them with a few different sizes. From what I gathered .35 seemed to be common.
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tmorris9
Re: How to determine specs on a used machine?
June 18, 2014 06:29PM
When you get it running, just extrude some in air and measure it with calipers. It won't be exact but real close. So if it extrudes and is say .4mm then it's likely a .35 nozzle, if it's closer to .6mm then it's a .5mm nozzle (the most common 2 sizes).
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Dust
Re: How to determine specs on a used machine?
June 19, 2014 02:38AM
back then they only had one thermister.

So its most likly a

type 1 100K Epcos NTC Thermistor, beta value 4066
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WillAdams
Re: How to determine specs on a used machine?
July 25, 2014 12:07AM
That doesn't seem to be the right one. Tried:

EPCOS100K

and repetierHost flickers between:

767.40, 841, 936.40, 1102.40, 1523.90

is there any way to puzzle out what the thermistor might be if those are the reading at room temperature?
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anwe79
Re: How to determine specs on a used machine?
July 25, 2014 02:49AM
Use an ohmmeter to measure the resistance at (a known) room temperature. You should be able to compare that value with the common types of resistors. To know for sure, also measure in ice water and boiling water for 0 and 100 degrees C. Those values are likely enough to narrow the possible thermistors down to one or very few types.

/Andreas
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WillAdams
Re: How to determine specs on a used machine?
July 25, 2014 06:37AM
Tried measuring, I believe I got 9.74 @20K @ ~23 degrees Celsius.

Tried all the possible values:

EPCOS100
RRRF100K
Honeywell100K
Semitec
HT100K

and didn't get anything reasonable.

What measurement would one get w/ a bad connection? (I had to wire in a molex connection and I'm not certain I did it right).
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Ralph.Hilton
Re: How to determine specs on a used machine?
July 25, 2014 07:01AM
How many ohms does the thermistor read at room temperature? Your readings suggest a bad connection.
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WillAdams
Re: How to determine specs on a used machine?
July 25, 2014 08:58AM
Isn't 23 degrees Celsius room temperature?

[www.google.com]

73.4 degree Farhenheit....
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Ralph.Hilton
Re: How to determine specs on a used machine?
July 25, 2014 10:13AM
Yes. so what was the resistance? "9.74 @20K" means what?? A usual answer would be something around 100k ohms but you might have one with another value or a faulty one.
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WillAdams
Re: How to determine specs on a used machine?
July 25, 2014 01:22PM
The display showed 9.74 when I was using the 20k reading (I don't know how to use a multimeter and was hoping to be walked through it).

However, it's a moot point since Catalin on the Shapeoko forums indicated this was a 10K part and so not useful for PID, so I swapped in the Semitec which survived the destruction of my hot end, and I should be good to go as soon as I find the Smoothie config forums and update my file.

Thanks!
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aplusa3d
Re: How to determine specs on a used machine?
July 31, 2014 01:39PM
Seems easy enough to just buy a new resistor that you know the spec on and put it in. Might be easier than what you have to guess through.
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DonaldJ
Re: How to determine specs on a used machine?
July 31, 2014 04:32PM
Check out buildlog.net .

A lot of OrBot info/links there, and the site is maintained by the OrdBot's creator, Bart Dring.
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