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Controlling heating elements in a heat tunnel
I need to build a method of heating part of a plastic handle, kinda'
like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? |
Controlling heating elements in a heat tunnel
On 6/6/2014 10:17 PM, Tom Gardner wrote:
I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? Oh, there won't be any bristles in the brush at the time of the bend. |
Controlling heating elements in a heat tunnel
Quote:
inside. It looks thicker where the bristles will go, so the handle will soften first. Pick a temperature somewhat above the softening temp of the plastic, then experiment with how long to leave it in the heat before you pull it out and bend it. Use an air blast or even a water spray to quench after the bend to freeze it into shape faster. Anything from a toaster oven to a surplus home oven depending on how hot and how many you want to heat at once. Convection oven would be even better, more uniform and faster heating. Or make a hinged heated block kind of like a waffle maker, with a channel where you want the bend. Open, insert, close, count to ten, open, remove, bend, quench. For that matter, dig out the waffle maker you have somewhere in a cabinet and never use, and modify that :-). ----- Regards, Carl Ijames |
Controlling heating elements in a heat tunnel
On Fri, 06 Jun 2014 22:17:49 -0400, Tom Gardner Mars@Tacks wrote:
I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? I wonder if one of the flexible acrylic bending heat strips would work for you. What temperature are you after? From what plastic are the handles made? What kind of speed/daily qty are you looking for? That might drive answers more into the realm of your wishlist. -- It is characteristic of all deep human problems that they are not to be approached without some humor and some bewilderment. -- Freeman Dyson |
Controlling heating elements in a heat tunnel
On 07-Jun-14 10:17 AM, Tom Gardner wrote:
I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? Would directed hot air be quicker? Might be easier to generate & control too. |
Controlling heating elements in a heat tunnel
On Fri, 06 Jun 2014 22:17:49 -0400, Tom Gardner Mars@Tacks wrote:
I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? If 212 degrees does it, I'd use boiling water, your choice of heater. water transfers heat 50X faster than air. Karl |
Controlling heating elements in a heat tunnel
"Tom Gardner" Mars@Tacks wrote in message
... I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? Amazon sells temperature controllers at a hobbyist price (and quality??). http://www.amazon.com/b?node=306533011 I heven't tried them, my collection is pre-owned Omron and Omega. -jsw |
Controlling heating elements in a heat tunnel
On Fri, 06 Jun 2014 22:17:49 -0400, Tom Gardner Mars@Tacks wrote:
I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? Lots of that stuff out there http://www.walmart.com/ip/Gardner-Be...5-1.5/15719869 http://www.pvcbendit.com/ http://www.instructables.com/id/Bend...cause-you-can/ http://www.pvcworkshop.com/bendpipe.htm http://www.hotbend.com/ etc etc I do work in a lot of shops that bend plastic.......they make a form to shape, and then it it with a heat gun. Paint stripper electric gizmo and let it form to the form G Something I didnt know..guy sent me this link some time back https://www.youtube.com/watch?v=Q-dtbBzky-s "Libertarianism IS fascism... Fascism is corporate government – a Libertarian’s wet dream" Tala Brandeis Owner at Tala Brandeis Associates" |
Controlling heating elements in a heat tunnel
On 2014-06-07, Tom Gardner Mars@Tacks wrote:
I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? I would use a stream of hot water. This is probably your cheapest solution and something that is safe and has no fire or environmental concerns. You would obviously recirculate the water. i |
Controlling heating elements in a heat tunnel
Tom Gardner wrote:
I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? Well for repeatability I'd opt for simplicity. Make up 2-3 removable forms using some light steel. U shaped channel with a pin to go through the hole. At the point you need the bend, bend the sheet metal to the correct angle. For the bending, use two heat guns with heat directors to spread the heat around the handle in the area of the bend. Connect the guns up to a simple speed controller so you can control the heat. In use the handle gets stuck in the form, form and handle go into air blast between guns. Heat softens the plastic enough that it bends down to match the form. Once it bends into place the operator pulls the form/handle out of the blast and sets it onto a cooling rack. Then it's simply a matter of repeating the process as needed. -- Steve W. |
Controlling heating elements in a heat tunnel
"Kennedy" wrote in message . au... On 07-Jun-14 10:17 AM, Tom Gardner wrote: I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? Would directed hot air be quicker? Might be easier to generate & control too. +1 I've used a heat gun on old toothbrushes and kitchen brushes to make bends for cleaning inaccessable places many times. Art |
Controlling heating elements in a heat tunnel
On 6/7/2014 12:42 AM, Carl Ijames wrote:
Quote:
Put a hole in the side or top of an oven and just stick the bristle end inside. It looks thicker where the bristles will go, so the handle will soften first. Pick a temperature somewhat above the softening temp of the plastic, then experiment with how long to leave it in the heat before you pull it out and bend it. Use an air blast or even a water spray to quench after the bend to freeze it into shape faster. Anything from a toaster oven to a surplus home oven depending on how hot and how many you want to heat at once. Convection oven would be even better, more uniform and faster heating. Or make a hinged heated block kind of like a waffle maker, with a channel where you want the bend. Open, insert, close, count to ten, open, remove, bend, quench. For that matter, dig out the waffle maker you have somewhere in a cabinet and never use, and modify that :-). ----- Regards, Carl Ijames Not MY waffle maker! It gets used at least once a month. I have a great recipe for waffles with flavor and just the right texture. But maybe a trip to Salvation Army... |
Controlling heating elements in a heat tunnel
On 6/7/2014 1:10 AM, Larry Jaques wrote:
On Fri, 06 Jun 2014 22:17:49 -0400, Tom Gardner Mars@Tacks wrote: I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? I wonder if one of the flexible acrylic bending heat strips would work for you. What temperature are you after? From what plastic are the handles made? What kind of speed/daily qty are you looking for? That might drive answers more into the realm of your wishlist. -- It is characteristic of all deep human problems that they are not to be approached without some humor and some bewilderment. -- Freeman Dyson New product, don't know. They are PVC...I think. |
Controlling heating elements in a heat tunnel
On 6/7/2014 3:46 AM, Kennedy wrote:
On 07-Jun-14 10:17 AM, Tom Gardner wrote: I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? Would directed hot air be quicker? Might be easier to generate & control too. Yep, used a heat gun for prototypes. |
Controlling heating elements in a heat tunnel
On 6/7/2014 8:22 AM, Jim Wilkins wrote:
"Tom Gardner" Mars@Tacks wrote in message ... I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? Amazon sells temperature controllers at a hobbyist price (and quality??). http://www.amazon.com/b?node=306533011 I heven't tried them, my collection is pre-owned Omron and Omega. -jsw Well, ****...there they are. Thanks! |
Controlling heating elements in a heat tunnel
On 6/7/2014 4:06 PM, Tom Gardner wrote:
On 6/7/2014 12:42 AM, Carl Ijames wrote: Quote:
Put a hole in the side or top of an oven and just stick the bristle end inside. It looks thicker where the bristles will go, so the handle will soften first. Pick a temperature somewhat above the softening temp of the plastic, then experiment with how long to leave it in the heat before you pull it out and bend it. Use an air blast or even a water spray to quench after the bend to freeze it into shape faster. Anything from a toaster oven to a surplus home oven depending on how hot and how many you want to heat at once. Convection oven would be even better, more uniform and faster heating. Or make a hinged heated block kind of like a waffle maker, with a channel where you want the bend. Open, insert, close, count to ten, open, remove, bend, quench. For that matter, dig out the waffle maker you have somewhere in a cabinet and never use, and modify that :-). ----- Regards, Carl Ijames Not MY waffle maker! It gets used at least once a month. I have a great recipe for waffles with flavor and just the right texture. But maybe a trip to Salvation Army... And the recipe is....... G share please. |
Controlling heating elements in a heat tunnel
On Sat, 07 Jun 2014 16:07:56 -0400, Tom Gardner Mars@Tacks wrote:
On 6/7/2014 1:10 AM, Larry Jaques wrote: On Fri, 06 Jun 2014 22:17:49 -0400, Tom Gardner Mars@Tacks wrote: I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? I wonder if one of the flexible acrylic bending heat strips would work for you. What temperature are you after? From what plastic are the handles made? What kind of speed/daily qty are you looking for? That might drive answers more into the realm of your wishlist. -- It is characteristic of all deep human problems that they are not to be approached without some humor and some bewilderment. -- Freeman Dyson New product, don't know. They are PVC...I think. Unlikely, but possible, I guess. -- It is characteristic of all deep human problems that they are not to be approached without some humor and some bewilderment. -- Freeman Dyson |
Controlling heating elements in a heat tunnel
On Sat, 07 Jun 2014 16:09:04 -0400, Tom Gardner Mars@Tacks wrote:
On 6/7/2014 3:46 AM, Kennedy wrote: On 07-Jun-14 10:17 AM, Tom Gardner wrote: I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? Would directed hot air be quicker? Might be easier to generate & control too. Yep, used a heat gun for prototypes. I recycle all my old toothbrushes into crevice brushes by bending an angle on the whole head or half the bristles. My trusty HF butane torch leaves a nice black residue on them. That's why I didn't suggest it for your use, Tawm. A heat gun and a spinner, then a jiggy rack to lay them on at the right angles, might be the ticket. -- It is characteristic of all deep human problems that they are not to be approached without some humor and some bewilderment. -- Freeman Dyson |
Controlling heating elements in a heat tunnel
On 6/7/2014 1:24 PM, Steve W. wrote:
Tom Gardner wrote: I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? Well for repeatability I'd opt for simplicity. Make up 2-3 removable forms using some light steel. U shaped channel with a pin to go through the hole. At the point you need the bend, bend the sheet metal to the correct angle. For the bending, use two heat guns with heat directors to spread the heat around the handle in the area of the bend. Connect the guns up to a simple speed controller so you can control the heat. In use the handle gets stuck in the form, form and handle go into air blast between guns. Heat softens the plastic enough that it bends down to match the form. Once it bends into place the operator pulls the form/handle out of the blast and sets it onto a cooling rack. Then it's simply a matter of repeating the process as needed. You make it sound so simple.... |
Controlling heating elements in a heat tunnel
Tom Gardner wrote:
On 6/7/2014 1:24 PM, Steve W. wrote: Tom Gardner wrote: I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? Well for repeatability I'd opt for simplicity. Make up 2-3 removable forms using some light steel. U shaped channel with a pin to go through the hole. At the point you need the bend, bend the sheet metal to the correct angle. For the bending, use two heat guns with heat directors to spread the heat around the handle in the area of the bend. Connect the guns up to a simple speed controller so you can control the heat. In use the handle gets stuck in the form, form and handle go into air blast between guns. Heat softens the plastic enough that it bends down to match the form. Once it bends into place the operator pulls the form/handle out of the blast and sets it onto a cooling rack. Then it's simply a matter of repeating the process as needed. You make it sound so simple.... Could be. I've bent some plastics over the years... -- Steve W. |
Controlling heating elements in a heat tunnel
On 6/10/2014 8:15 PM, Steve W. wrote:
Tom Gardner wrote: On 6/7/2014 1:24 PM, Steve W. wrote: Tom Gardner wrote: I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? Well for repeatability I'd opt for simplicity. Make up 2-3 removable forms using some light steel. U shaped channel with a pin to go through the hole. At the point you need the bend, bend the sheet metal to the correct angle. For the bending, use two heat guns with heat directors to spread the heat around the handle in the area of the bend. Connect the guns up to a simple speed controller so you can control the heat. In use the handle gets stuck in the form, form and handle go into air blast between guns. Heat softens the plastic enough that it bends down to match the form. Once it bends into place the operator pulls the form/handle out of the blast and sets it onto a cooling rack. Then it's simply a matter of repeating the process as needed. You make it sound so simple.... Could be. I've bent some plastics over the years... I had to do 5 samples today, they took 3 minutes apiece to heat with my good heat gun. I can see how to do it better now. |
Controlling heating elements in a heat tunnel
Tom Gardner wrote:
On 6/10/2014 8:15 PM, Steve W. wrote: Tom Gardner wrote: On 6/7/2014 1:24 PM, Steve W. wrote: Tom Gardner wrote: I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? Well for repeatability I'd opt for simplicity. Make up 2-3 removable forms using some light steel. U shaped channel with a pin to go through the hole. At the point you need the bend, bend the sheet metal to the correct angle. For the bending, use two heat guns with heat directors to spread the heat around the handle in the area of the bend. Connect the guns up to a simple speed controller so you can control the heat. In use the handle gets stuck in the form, form and handle go into air blast between guns. Heat softens the plastic enough that it bends down to match the form. Once it bends into place the operator pulls the form/handle out of the blast and sets it onto a cooling rack. Then it's simply a matter of repeating the process as needed. You make it sound so simple.... Could be. I've bent some plastics over the years... I had to do 5 samples today, they took 3 minutes apiece to heat with my good heat gun. I can see how to do it better now. Make up a U shaped deflector to contain and direct the heat. One gun feeding from each side OR if you don't want hot air grab some nextflex heating element, Bend it into a series of U shapes with guards and use that. http://www.nexthermal.com/product/nextflex.aspx -- Steve W. |
Controlling heating elements in a heat tunnel
"Tom Gardner" Mars@Tacks wrote in message
... I had to do 5 samples today, they took 3 minutes apiece to heat with my good heat gun. I can see how to do it better now. I just heated a 1/4" spot on a black plastic brush handle molten/smoking hot in less than a minute with a 50W Halogen reflector bulb, a Sylvania PAR20. There's a focal point less than an inch from the face. http://www.amazon.com/Sylvania-14700.../dp/B000KKJXP8 -jsw |
Controlling heating elements in a heat tunnel
On Wed, 11 Jun 2014 12:36:17 -0400, "Steve W."
wrote: Tom Gardner wrote: On 6/10/2014 8:15 PM, Steve W. wrote: Tom Gardner wrote: On 6/7/2014 1:24 PM, Steve W. wrote: Tom Gardner wrote: I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? Well for repeatability I'd opt for simplicity. Make up 2-3 removable forms using some light steel. U shaped channel with a pin to go through the hole. At the point you need the bend, bend the sheet metal to the correct angle. For the bending, use two heat guns with heat directors to spread the heat around the handle in the area of the bend. Connect the guns up to a simple speed controller so you can control the heat. In use the handle gets stuck in the form, form and handle go into air blast between guns. Heat softens the plastic enough that it bends down to match the form. Once it bends into place the operator pulls the form/handle out of the blast and sets it onto a cooling rack. Then it's simply a matter of repeating the process as needed. You make it sound so simple.... Could be. I've bent some plastics over the years... I had to do 5 samples today, they took 3 minutes apiece to heat with my good heat gun. I can see how to do it better now. Make up a U shaped deflector to contain and direct the heat. One gun feeding from each side OR if you don't want hot air grab some nextflex heating element, Bend it into a series of U shapes with guards and use that. http://www.nexthermal.com/product/nextflex.aspx Ive got one of the heat shrink adapters for one of my heat guns..nothing more than a bent "tubey thingy" that wraps around the part Works well enough for bending the few pieces of plastic Ive had to do. Then of course there was the time the plastic caught fire...but that doesnt count..right? "Libertarianism IS fascism... Fascism is corporate government – a Libertarian’s wet dream" Tala Brandeis Owner at Tala Brandeis Associates" |
Controlling heating elements in a heat tunnel
On Sat, 07 Jun 2014 06:33:02 -0500, Karl Townsend
wrote: On Fri, 06 Jun 2014 22:17:49 -0400, Tom Gardner Mars@Tacks wrote: I need to build a method of heating part of a plastic handle, kinda' like this one: http://www.amazon.com/Better-Brush-U.../dp/B006GP591I I need to bend it 20 degrees at the neck. I have a few heating elements from water heaters or I'll buy the best candidate, whatever I can control. Or, I'd buy the hole kit-n-ca-bootle off the shelf. Any suggestions? If 212 degrees does it, I'd use boiling water, your choice of heater. water transfers heat 50X faster than air. Karl If 212 degrees (F) isn't enough, you could use molten metal in a temperature-controlled pot. There are several metals (e.g. Cerro-bend, Cerro-safe) that melt below 212F. They contain no lead so they're not hazardous. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com |
Controlling heating elements in a heat tunnel
dforeman fired this volley in
: They contain no lead so they're not hazardous. And often cadmium, which is. There is mostly tin and bismuth in there, but there are other metals in there to tune the melting point; some are toxic to a high degree. Lloyd |
Controlling heating elements in a heat tunnel
First, let me say that I told ya wrong: some of these low melting
point alloys really do contain lead, cadmium or both. That said, there are low melting point alloys that contain neither lead nor cadmium, for those who have particular sensitivity to or fear of those elements. Please see, e.g., http://www.csalloys.com/specifications.html Regard, please, that at these low temperatures the vapor pressures of lead and cadmium are miniscule compared to what they'd be at even soldering temperatures -- and I think Tawm would responsibly provide ventilation in an industrial setting to meet OSHA requirements and otherwise operate responsibly. On Sat, 11 Apr 2015 11:02:14 -0500, "Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote: dforeman fired this volley in : They contain no lead so they're not hazardous. And often cadmium, which is. There is mostly tin and bismuth in there, but there are other metals in there to tune the melting point; some are toxic to a high degree. Lloyd |
Controlling heating elements in a heat tunnel
Don Foreman fired this volley in
: lead and cadmium are miniscule compared to what they'd be at even soldering temperatures -- and I think Tawm would responsibly provide ventilation in an industrial setting to meet OSHA requirements and otherwise operate responsibly. Yep. I was mentioning that because they are also hand-to-mouth ingestion hazards. One needs to work clean. CerroTru contains neither, but doesn't melt at as quite a low temp as some of the others. Lloyd |
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