Re: Hotbed flatness, voodoo or scientific method? June 22, 2015 11:15PM |
Registered: 11 years ago Posts: 5,780 |
Re: Hotbed flatness, voodoo or scientific method? June 22, 2015 11:21PM |
Registered: 11 years ago Posts: 1,277 |
Re: Hotbed flatness, voodoo or scientific method? June 22, 2015 11:55PM |
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Re: Hotbed flatness, voodoo or scientific method? June 23, 2015 03:51AM |
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Re: Hotbed flatness, voodoo or scientific method? June 24, 2015 12:34AM |
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Re: Hotbed flatness, voodoo or scientific method? June 24, 2015 07:14AM |
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Re: Hotbed flatness, voodoo or scientific method? June 24, 2015 09:10AM |
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Re: Hotbed flatness, voodoo or scientific method? June 24, 2015 11:33AM |
Registered: 11 years ago Posts: 1,277 |
Oops, this is not how I did it as the wires going in from the back side (for 3 point) was so much easier. My frog plate's now stripped hole (in your scheme) would have my strip so would be locked down with the middle hole facing to the left side. I really think having this MK2 is hindering me in many many ways. Trinity Labs used to carry a self sticking flexible Kapton like heater with everything all ready to go.[edit: in your Instructables post I was reading it just now and spotted the Kapton heater I was talking about which makes all of this so much easier.] I don't care much for those silicone heaters as they are reported to have their own set of issues. Phenoelic board based heaters have warp, flex, and those mounting points on one side that will dead short on you with anything metal (like a heat spreader or this dead flat aluminum plate) laying across it.Quote
the_digital_dentist
The bottom right and left side holes align with the Y axis
Re: Hotbed flatness, voodoo or scientific method? June 24, 2015 05:46PM |
Registered: 11 years ago Posts: 1,277 |
Re: Hotbed flatness, voodoo or scientific method? June 24, 2015 10:15PM |
Registered: 9 years ago Posts: 483 |
Re: Hotbed flatness, voodoo or scientific method? June 24, 2015 10:28PM |
Registered: 11 years ago Posts: 1,277 |
Damn, my laser level is only a dot. :/ Digital Level with a laser inside and it is a dot.Quote
etfrench
You can use an inexpensive laser pointer to test flatness. Here's one site with an explanation: [www.cnccookbook.com]
Re: Hotbed flatness, voodoo or scientific method? June 25, 2015 01:14AM |
Registered: 11 years ago Posts: 1,277 |
Re: Hotbed flatness, voodoo or scientific method? June 25, 2015 10:07AM |
Registered: 11 years ago Posts: 335 |
Re: Hotbed flatness, voodoo or scientific method? June 25, 2015 11:15AM |
Registered: 11 years ago Posts: 1,277 |
I have heard some bad things about silicone heaters. First of all they break down, or so it is said, and secondly the thermistor temps are really off by a lot. Probably due to being in the wrong position on not really touching the surface that is being heated up. Kapton heaters don't suffer from that if the thermistor is put in the middle and touches the surface being heated.Quote
691175002
I'm using one of these for a build I'm working on:
[www.ebay.com]
I was intrigued because they let you completely customize the heater. You can choose the voltage, power, size, shape, thermistor and have some neat options like an insulating layer on the back. Their webpage has some more information on the options available.
I contacted them with what I wanted (6"x6", 200W, 24V, adhesive backed, 5mm insulation, ntc100) and they put up the listing for me.
It still hasn't arrived so I don't know what the quality is like.
Re: Hotbed flatness, voodoo or scientific method? June 25, 2015 12:42PM |
Registered: 10 years ago Posts: 14,672 |
Quote
Dark Alchemist
I have heard some bad things about silicone heaters. First of all they break down, or so it is said, and secondly the thermistor temps are really off by a lot. Probably due to being in the wrong position on not really touching the surface that is being heated up. Kapton heaters don't suffer from that if the thermistor is put in the middle and touches the surface being heated.
Re: Hotbed flatness, voodoo or scientific method? June 25, 2015 01:33PM |
Registered: 11 years ago Posts: 1,277 |
Re: Hotbed flatness, voodoo or scientific method? June 30, 2015 05:25AM |
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Re: Hotbed flatness, voodoo or scientific method? June 30, 2015 06:31AM |
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Re: Hotbed flatness, voodoo or scientific method? June 30, 2015 06:44AM |
Registered: 11 years ago Posts: 1,277 |
If I do buy it I will put the new hole inbetween the two SC8UUs as there is room there and the other side with the one SC8UU doesn't have much meat there for a M3 tapped hole.Quote
the_digital_dentist
That plate looks a lot better than the one you started with. Just drill a third hole next to the single bearing.
If you're looking for something premade that is exactly what you need to fit your machine I think you'll be looking for a looooong time, and maybe never finding.
Re: Hotbed flatness, voodoo or scientific method? June 30, 2015 10:24AM |
Registered: 11 years ago Posts: 5,780 |
Re: Hotbed flatness, voodoo or scientific method? June 30, 2015 10:30AM |
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Re: Hotbed flatness, voodoo or scientific method? June 30, 2015 10:35AM |
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Re: Hotbed flatness, voodoo or scientific method? June 30, 2015 10:37AM |
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Re: Hotbed flatness, voodoo or scientific method? June 30, 2015 10:46AM |
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Re: Hotbed flatness, voodoo or scientific method? June 30, 2015 03:57PM |
Registered: 11 years ago Posts: 1,277 |
Re: Hotbed flatness, voodoo or scientific method? July 01, 2015 05:16PM |
Registered: 9 years ago Posts: 396 |
Quote
Dark Alchemist
So, I am looking for a Kapton heater to stick onto the flat plate and went to AliExpress since eBay was doa.
Here is a picture of the one being sold:
I asked the seller "You supply a thermistor for this but where does it go? Seems you forgot to make a hole in the middle of the heater for it." and I get a response that this is what they are selling and the picture used in the listing is for reference only.
Still, that thermistor is in the wrong spot but why would you use the first picture as your listing picture when the second one is accurate and just looks more professional AND doesn't even remotely look like the listing picture? edit: Am I not wrong but when you enlarge the second picture right in the middle is a spot for a thermistor? Sure looks like it to me so why of to the side like that?
What I am looking for is 200mm square 24v @200 watts that will stick to the bottom so I can use the metal flat plate's third hole I will drill and not the MK2B's and have to cut away the metal around the power connectors.
Re: Hotbed flatness, voodoo or scientific method? July 01, 2015 07:30PM |
Registered: 11 years ago Posts: 1,277 |
Re: Hotbed flatness, voodoo or scientific method? July 01, 2015 08:50PM |
Registered: 9 years ago Posts: 396 |
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tazz, I did the same and forget it.
Re: Hotbed flatness, voodoo or scientific method? July 01, 2015 10:41PM |
Registered: 11 years ago Posts: 1,277 |
Well, three screws are better at this than four and I can attest to that for me. They say three points define a plane but what they forget to tell you is that the three points must be non-collinear to define a plane. Well, if you look at our 3 points on our beds I think they fail that criteria but I am not 100% sure since one of the points is not collinear with the other two.Quote
thetazzbot
Quote
tazz, I did the same and forget it.
i don't know what that means...
i feel like the corners without attachments will move or sag one way or the other. it's just a gut feeling. if the spring between the two plates is at all week, somethings going to wiggle where it shouldnt. i'm not an expert.. but i know that if i have one screw in the middle, i can press down on a corner and it will move, and that bugs me.
so what i have is one static screw with a spacer in one corner, and three adjusters in the remaining corners.
Re: Hotbed flatness, voodoo or scientific method? July 02, 2015 01:25AM |
Registered: 11 years ago Posts: 5,780 |