[Lab] Plastic Bending Strips

[Henri Kuschkowitz]

Interesting stuff. I will look into it.
Thanks a lot for the information, Michael.

Cheers,
Henri

On 2013-07-04, at 4:25 PM, Michael Grant <michael at krazatchu.ca> wrote:

> That power supply is also known as an autotransformer.
> https://en.wikipedia.org/wiki/Autotransformer
> 
> Care should be taken with an autotransformer, while the voltage can be set low, there is no, none, zero galvanic isolation.
> Meaning the full current of the service is available (20amps). Treat the output as you would treat 120VAC direct from a receptacle...
> 
> I've never seen one in the lab, but they do have a variable  DC supply that is maybe 3amps and 30v max.
> Depending on the load, the heating element, you might be able to use one of those twisty things for lights...
> Alternatively, an AC thermostat for bang bang control with hysteria should also work if you keep the thermal loop tight.
> 
> The last and best option would be a ~$14 PID controller from ebay, that would give the best thermal regulation. 
> Sometimes they come in a kit with an SSR (solid state relay) and a thermocouple for a little more dough...
> Here's one kit for $24...
> http://www.ebay.ca/itm/100-240V-Digital-PID-Temperature-Controller-max-40A-SSR-K-Thermocouple-Probe-/290825156892?pt=LH_DefaultDomain_0&hash=item43b687b91c
> 
> 
> Michael
> --
> http://krazatchu.ca/
> 
> 
> On Thu, Jul 4, 2013 at 4:07 PM, Henri Kuschkowitz <henri.kuschkowitz at gmail.com> wrote:
> So, I am still getting some more costs tomorrow, but I think I might go with this quick/dirty setup: http://www.youtube.com/watch?v=wVEf7PfuKxo 
> 
> What do you guys think? This leads me to my next question, would anybody know if the lab has an item similar to this:
> http://www.temcoindustrialpower.com/products/Variable_Transformers/TVT001.html?utm_source=temcotransformer.com&utm_medium=Banner%2BAd&utm_campaign=Variac%2BTVT001
>  
> 
> Cheers all,
> Henri
> 
> On 2013-07-04, at 7:54 AM, Alex <alexbarbour at bell.net> wrote:
> 
>> Henri
>>  
>> Angle iron is a common name applied to steel angles. some are extruded in the heavier sections and have a sharp outside corner.
>>  
>> Some are bent from flat stock and have a radiused corner.
>> These are better for use as formers for plastics.
>>  
>> Home depot. Hardware dept.
>> CTC ect.
>> ----- Original Message -----
>> From: Henri Kuschkowitz
>> To: Alex
>> Sent: Wednesday, July 03, 2013 9:12 AM
>> Subject: Re: [Lab] Plastic Bending Strips
>> 
>> Hey Alex,
>> 
>> I have a very particular type of acrylic we are going to be using that I doubt comes 'bendable'. Angle iron? I haven't seen those before. Got a reference or suggestion?
>> 
>> Cheers,
>> Henri
>> 
>> On 2013-07-03, at 8:03, Alex <alexbarbour at bell.net> wrote:
>> 
>>> On the other hand they do produce an acrylic sheet that can be bent cold .
>>> Have done small pieces by hand. For larger OR thicker ( say 1/8 inch + )one needs a former for the edge. Angle iron with a round egde serves well.
>>> Alex B
>>> ----- Original Message -----
>>> From: Henri Kuschkowitz
>>> To: lab
>>> Sent: Tuesday, July 02, 2013 3:09 PM
>>> Subject: [Lab] Plastic Bending Strips
>>> 
>>> Hey guys,
>>> 
>>> I figured it's a good time to start asking the collective for some feedback. We are planing on bending larger sheets of acrylic (they will definitely not fit into the laser cutter) and I am looking at bending strip heaters to build a custom heating element for our purposes. Before I go ahead ordering the pieces I was wondering if anyone had ever used such a thing and/or knows of a good local source? For saving some money, I wonder if reusing a baseboard heater could do the trick :P
>>> 
>>> Cheers all,
>>> Henri 
>>>       
>>> 
>>> 
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> 
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