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Author Topic: Impact engraving plugin  (Read 255823 times)

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Re: Impact engraving plugin
« Reply #380 on: July 03, 2017, 02:49:14 PM »
The last that i did were 48 oh ms.above 14 vcc it gets a little hot

Offline Dan13

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Re: Impact engraving plugin
« Reply #381 on: July 03, 2017, 04:26:39 PM »
Oh, that is very small current.
Re: Impact engraving plugin
« Reply #382 on: July 04, 2017, 08:08:03 AM »
Dan, I will take a pic of my solenoid, I use two with 48 ohm , they have 30 mm round , with an air core of 10 mm and #32 copper wire. They are a little hard to produce without a winding machine , but with paciente you can do it manually. The solenoids must be between  magnets and three rounds of magnets as this magnet-solenoid-magnet-solenoid-magnet so when you input voltage to the solenoid it will repell itself from the magnets.Its more of a electromagnet constrution inverted and not properly a solenoid.It will not have ferrite or mild steel core , the only iron that i have is in the rolls and they are not even near the magnets or the solenoids

Offline Dan13

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Re: Impact engraving plugin
« Reply #383 on: July 04, 2017, 11:55:21 AM »
Jan,

Thanks for explaining. My configuration is different. See attached photo. The magnets are between the lever and the base. The lever is suspended and balanced with the magnets at both ends. The electromagnet is stationary and pulls the lever at one end. There is an iron piece on the lever at that end. The setup works fine with the 2ohm coil, has sufficient power and amplitude up to 100Hz.

The problem is the heating. Today wound a new coil (the one on the picture), 14 ohm. but it is less powerful now and so the amplitude drops as it gets to higher frequencies. I think it has to do with the inductance. Modern stepper motors have typical resistance of the coils around 2 ohm, thus keeping the inductance low and allowing for higher speeds. The drivers limit the current so the motors don't heat up to much.

Dan
Re: Impact engraving plugin
« Reply #384 on: July 09, 2017, 01:49:35 PM »
Dear Jan, I've been following this thread for a long time to understand how your impact head is built, but I'm still not sure how it will be designed to be effective.
I would be very grateful if you could take a photo ocn head with magnets and coil placement, I think that would greatly facilitate understanding.  :)
Best regards Christer

Offline Dan13

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Re: Impact engraving plugin
« Reply #385 on: September 07, 2017, 03:33:22 AM »
Did away with the L298 driver and designed a simple switch based on a MOSFET. Due to the extremely low resistance of the transistor it doesn't heat at all. So the heating problem is solved. Getting 100Hz is not a problem and it works very well.

Dan

Offline Tweakie.CNC

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Re: Impact engraving plugin
« Reply #386 on: September 07, 2017, 03:41:46 AM »
Excellent work Dan.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: Impact engraving plugin
« Reply #387 on: September 07, 2017, 07:14:54 AM »
He Who wants do ;D
But He that do not Want always has an excuse.
Good work!
Have you used my program?
« Last Edit: September 07, 2017, 07:16:25 AM by Jan Mozol »

Offline Dan13

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Re: Impact engraving plugin
« Reply #388 on: September 07, 2017, 07:35:07 AM »
Thanks guys.

Jan, no - didn't use your program. I used PicEngrave  and the rotary engrave option.

Dan