tag:blogger.com,1999:blog-4960833485745755917.post1383257426365879863..comments2022-07-12T12:08:55.695+01:00Comments on Bodge It Quick Rep Strap Bertha Project: Rep strap Mini/Micro Mendel Heated Bed using Fire GlassAnonymoushttp://www.blogger.com/profile/11790019375326311849noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-4960833485745755917.post-79223955087649058452010-03-01T02:42:39.999+00:002010-03-01T02:42:39.999+00:00Thank you both for your sugestions as they are use...Thank you both for your sugestions as they are usefull for any one else who wants to do this.<br /><br />Getting a lower resistance Nichrom wire would much better!!<br />particularly for running on 12V, <br /><br />I have less than 14 days to get this working for the show. So Im stuck with what I have/could get easily.<br /><br />Heres the wikipedia link for ceramic glass<br /><br />http://en.wikipedia.org/wiki/Glass-ceramic.<br /><br />I dont know if sheet Aluminum is more expensive to get than the fire glass. It was just easier for me to get fire glass as wood burning stoves are a bit of a fashion / eco thing here.Anonymoushttps://www.blogger.com/profile/11790019375326311849noreply@blogger.comtag:blogger.com,1999:blog-4960833485745755917.post-3776898556671575222010-03-01T02:16:36.928+00:002010-03-01T02:16:36.928+00:00@Casainho I've not noticed any hot spots with ...@Casainho I've not noticed any hot spots with my infrared thermometer that I used to look at the how even the temprature was.<br /> Was kind of hopping that the high temprature glass conducted heat more evenly tho..<br /><br />I think its called ceramic glass or LAS glass-ceramic as a whole has a thermal expansion coefficient that is very close to zero. LAS stands for lithium, aluminum, and silicon.<br /><br />Thank you sorry I alredy have 4 of the RepRap Extruder 2.1 PCBs built its similar idea to your CCT I think.<br /><br />I'm not sure how to hold a glass thermistor to the glass plate maybe supperglue / Araldite rather than a glass on glass friction connection. <br /><br />@Triffidhunter every part of the glass is 15mm from the heating element. Once at temprature I think the effect is reasonably even. All of the other nichrome runs did get the glass up to temprature but they took a little too long. I thought<br />it was better to have a fast heat up time 6 Minutes is fast. Much faster than my aluminum bed.<br />I had thought of parallel runs though. If I get problems I could have 6-8 straight runs at 10mm apart.<br /><br />I'm using 24-30 Volt supply its better for stepper motor driving.<br /><br />I have MDF as my insulator as plastic kinda burns with fast heating the MDF seems to be a better insulator than the plastic was. What material were you thinking of as an insulator?Anonymoushttps://www.blogger.com/profile/11790019375326311849noreply@blogger.comtag:blogger.com,1999:blog-4960833485745755917.post-89965395987311802142010-02-28T20:57:25.039+00:002010-02-28T20:57:25.039+00:00for more even heating and ability to run from 12v,...for more even heating and ability to run from 12v, consider two or more runs of nichrome in parallel, in different areas of your glass plate.<br /><br />Insulating the underside would probably help tooTriffid Hunterhttps://www.blogger.com/profile/11285832141131462463noreply@blogger.comtag:blogger.com,1999:blog-4960833485745755917.post-88622708116359914962010-02-28T17:57:25.388+00:002010-02-28T17:57:25.388+00:00And if you are going to make heater control, could...And if you are going to make heater control, could you please consider doing and testing the following circuit?<br /><br />http://objects.reprap.org/wiki/Heated_Bed<br /><br />Or maybe you can find one more simple and report it :-)Casainhohttps://www.blogger.com/profile/09458423869238512900noreply@blogger.comtag:blogger.com,1999:blog-4960833485745755917.post-13893610695591974082010-02-28T17:53:47.457+00:002010-02-28T17:53:47.457+00:00Looks like you are measuring the temperature in th...Looks like you are measuring the temperature in the middle of two pieces of heated wire.<br /><br />Since glass is "half" temperature insulator, would be important that you verify that you get the same temperature values over almost all glass area.Casainhohttps://www.blogger.com/profile/09458423869238512900noreply@blogger.com