Induction Heater Part 2: 

use a pc liquid cooling radiator so you can lower the cooling time

your coil is wrong shape. Make another with fewer turns so the effect area can be focused on the tool holder only and not the endmill body. Caution, the coil need to balance with the capacitors. Do some googling for that.

Couple thoughts: 1) increasing the frequency decreases "skin depth", which could be helpful for tooling. 2) a high discharge lithium ion battery pack could let you up the power considerably. I know some ebike guys are pushing 60kW, and some high discharge 18650s are good for 30-45 amps each. 3) it'd be interesting to place an alumina or quartz tube inside the coil, with parts inside the tube (run horizontal). I think that could be a neat arrangements for heat-treating. Either is cheap on eBay, but alumina is refractory.

With the backstory i like hlaps1990 even more, now it has character

I think steel has a thermal expansion a bit more than twice that of tungsten carbide, according to a rapid googling. And it looks like steel conducts electricity a bit better too. My point is that it seems that you have a fighting chance with a slow heating.

Good to know a standard psu/pc one would work. I am looking into variacs and relays to make mine safe lol. Having a portable bolt "tau cannon" seems to be super cool! Nice work!

Coil diameter should be 1/2 to 2/3 larger diameter then the workpiece basically as close as possible without shorting to the sides great video do a bit on your power supply circuit

Bro I have the same Circuit but I’m running it at 1200 Watts

Good decision to change the channel-name ;)

Hello! When the induction heater is i your shop, you can use one of those tanks that hold windshield cleaner liquid in cars. There are tanks that have one compartment. A larger reservoir tank will help you, and longer and thinner hoses might also function as a diy radiator. Just an idea. Thanks for makeing videos.

You could place some water or oil or something under so the end mil is being kept cool

I always look forward to seeing your new videos!! The way you explain everything makes it fun and educational to watch.

Your mat is upside down

good setup, except it bugs me that you're using your power supply as a "stand" with water hose connections right above mains! You're blocking the cooling fan too on PS.

Question for the switch you have, instead of the switch can you put a PID there?

Question for the switch you have, instead of the switch can you put a PID there?

Nice video. The biggest problem is obviously your power supply is just not up to par. It is actually 7.3A not 7.8 and rated for 350W. And you are not likely to get that on 120v.

Maybe put a small cup of water underneath and leave the end mill slightly submerged in the water to keep it cool while the holder heats up. I need to finish my induction heater....I too get distracted by projects

maybe you have adhd like me start easy finishing not so much

I used them for bearings etc ..i installed a new main shaft in a 1 ton Muncie 4 speed I put the shaft in the freezer overnight and heated the bearings they dropped on so easy I thought I had a problem when it all hit room temp ..wow definitely have to use large hydraulic press to remove them I think the tooling would work great

A couple of tips.. If I may :) add a current meter it will help indicate if your in the ideal location inside the coil (although this is normally dead centre) also to help keep the system cool I'd wire the pump directly into the psu, so it will continue cooling the coil and more importantly the water when your not heating

Hello, thanks for the video. I watched part 1 as well and have a lot of interest in getting something like this to work for shrink fit tool holders used with carbide tooling. Any plans on making a video that finalizes that design?

Hook up to a tap and let it run. I hope this doesn’t offend: First of I believe in conservation, I am lucky to live where I turn on the tap and clean great tasting cool water comes out.... How ever... I used to run a still, I did the math and it was cheaper and more effective to just run the cooling tower off the tap and let run out the drain.....

dude, where did you get the protective sleeve from? the white stuff on the coil.. and whats it called exactly? Any idea where i can get it from in south africa?

Thanks for sharing and especially trying out what we talked about on Instagram! This is quite a large toolholder you have, I saw a setup like that on the Technishow I visited a couple of weeks ago. I got a demonstration at the Haimer booth and I noticed that they use a double coil setup and the smallest version is rated at 10kW on 400V (so 10times the coil you use for this test) and up to 33kW. I am still curious though if it can be done with a similar setup (dual coil but done with these ebay induction heaters) and with smaller diameter toolholders (so for the 1/8" shank tools) and on a SK15 toolholder or HSK E25 (Similar to this but with less "meat" that needs to be heated: www.haimer-usa.com/products/tool-holders/din-69893-hsk-a-hsk-e-hsk-f/hsk-e25/shrink-fit-chuck/mini-shrink-chuck-extra-slim.html) I won't bother asking you to try it, I will do that myself in the near future. Pretty cool: That setup haimer demonstrated heats so fast that it can be used with HSS tools

You need a radiator in the water system. You have added water mass to absorb heat but when the water heats up you are back where you started. If the water boils you have a real problem.

Start something and cant finish....i can relate to that...sub from NZ, keep up the good work!

Thank you for a great video! I like your approach towards the projects, “higher end” quality parts, attention to details and good knowledge of mechanical engineering. I also do like your current name of the channel! Please keep going, I will try to support you through the patreon page!

I'm probably the guy who asked about the heat shrink tooling, thank you very much for this experiment! I made 8 tool holders this easter, got them with awsome TIR. I can get in and out the tool with the torch easily. May try a 1800W unit, the problem is the power supply (my CNC power supply is 48V, 400W). I'm thinking on using 4 car batteries on series...

Looking forward to seeing what you've got in store for the cnc lathe. That's the project that brought me to your channel.

Do the coils ever get hot if nothing is ever placed in it to heat up?

You might find that you can reduce the number of coils to tune the resonant frequency, having said that a new coil can be easily wound with salt packed in a straight tube and then dissolved once wound. i have heard that there are certain frequencies for certain tasks but you should get better at making them so you can swap out new ones...

I think the magnetism rule about efficiency falls with the square of the distance applies to your coil diameter

Don't worry your not the only one who needs to work on project completion

can you melt iron an copper with this induction heater ??

Could you get more heat out of it if you make the coil shorter?

The video starts at 3:35

A radiator with a fan for the water system?

00:45 hahaha Are you running it on mains frequency (50-60Hz)? The induction tooling setup I've seen ran 10-40kHz, supposedly the higher the frequency the faster but shallower the heating.