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MAXPAYNE
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 « on: January 10, 2015, 03:14:01 15:14 »

I would like to know what "EE1621" means. I guess the 2 cores are E shaped, 16 is the outer dimension (not sure), 21 is for "what" ?

This is extracted page from a PI reference design-
http://ac-dc.power.com/design-support/reference-designs/design-examples/rdr-420-10-w-cv-cc-usb-charger/

Is there any general standard for the ferrite core type naming ?
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CocaCola
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 « Reply #1 on: January 10, 2015, 07:03:30 19:03 »

EE = Core Shape
16 = Core Length (A)
21 = Core Height (C)

 « Last Edit: January 10, 2015, 07:06:05 19:06 by CocaCola » Logged
solutions
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 « Reply #2 on: January 11, 2015, 04:00:57 04:00 »

Related (now that he got his answer): anyone ever cut or modify a core shape (like from a slab of ferrite)?

If so, how'd you do it?
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MAXPAYNE
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 « Reply #3 on: January 11, 2015, 04:21:22 04:21 »

EE = Core Shape
16 = Core Length (A)
21 = Core Height (C)

Are you sure the core height is "C" ? Looks like it will be "B". May be I am wrong ..
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CocaCola
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 « Reply #4 on: January 11, 2015, 05:22:15 05:22 »

Are you sure the core height is "C"

Yes...

The designation is carried over from regular 'circular' cores, as seen below...

Posted on: January 10, 2015, 11:01:51 23:01 - Automerged

Related (now that he got his answer): anyone ever cut or modify a core shape (like from a slab of ferrite)?

If so, how'd you do it?

Grinding or other abrasive tooling, slow with lots of water and no chatter...
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solutions
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 « Reply #5 on: January 11, 2015, 06:17:52 06:17 »

Yeah - I know about the grinding. Thanks anyway.

I was hoping someone here had figured out a way to do it on a home CNC milling machine without grinding up the ways/bearings
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pickit2
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 « Reply #6 on: January 11, 2015, 11:46:49 11:46 »

Why not find the data sheet, having the number is worth putting to google.
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Ichan
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 « Reply #7 on: January 11, 2015, 01:13:23 13:13 »

I was hoping someone here had figured out a way to do it on a home CNC milling machine without grinding up the ways/bearings

I think a sintered diamond router bit can be used, comonly used for stone / marble - got it china made, cheap as usual.

Recently i cut ceramic tile with it, and i guess ferrite core is not harder than that.

-ichan
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MAXPAYNE
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 « Reply #8 on: January 11, 2015, 01:20:11 13:20 »

Why not find the data sheet, having the number is worth putting to google.

No offense bro but I think you didn't get the point what Cocacola did. My concern was the naming standard ... not the datasheet.
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CocaCola
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 « Reply #9 on: January 11, 2015, 05:01:13 17:01 »

No offense bro but I think you didn't get the point what Cocacola did. My concern was the naming standard ... not the datasheet.

To be fair a data sheet for part 'EE-1621' would have answered your question as well as the datasheet contains full dimensions and usually a description of the part number designation...
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MAXPAYNE
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 « Reply #10 on: January 11, 2015, 05:06:58 17:06 »

To be fair a data sheet for part 'EE-1621' would have answered your question as well as the datasheet contains full dimensions and usually a description of the part number designation...

Unfortunately I didnt find any datasheet which described the part number description. All I found with googling is the file which is attached by pickit2
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solutions
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 « Reply #11 on: January 11, 2015, 06:29:46 18:29 »

Ichan - another one of your Renaissance-Man projects. Genius G-code skills, as well, to get sharp corners like that from that bit

I think you're correct in guessing it may work on ferrite. If it says "diamond" in it here, they rape you on the price, despite the bits being made from glued-on floor sweepings. Mind sharing where you got the bit shown, and the smaller diameter one for trimming the corners, speeds and feeds(if you remember what they were), as well as their cost? If so, please put that info in a text attachment, not out in the open.

Nice looking tile pattern, though...that must have scored you at least a month of bedroom passes
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CocaCola
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 « Reply #12 on: January 11, 2015, 06:57:53 18:57 »

Unfortunately I didnt find any datasheet which described the part number description. All I found with googling is the file which is attached by pickit2

When I search for 'EE1621 designation'

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Gallymimu
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 « Reply #13 on: January 12, 2015, 01:45:19 01:45 »

Ichan - another one of your Renaissance-Man projects. Genius G-code skills, as well, to get sharp corners like that from that bit

I think you're correct in guessing it may work on ferrite. If it says "diamond" in it here, they rape you on the price, despite the bits being made from glued-on floor sweepings. Mind sharing where you got the bit shown, and the smaller diameter one for trimming the corners, speeds and feeds(if you remember what they were), as well as their cost? If so, please put that info in a text attachment, not out in the open.

Nice looking tile pattern, though...that must have scored you at least a month of bedroom passes

I haven't done it myself but I've asked a lot about this as we've had custom cores made in Korea and China.  From what I understand, most methods for machining ceramics will work, but it is, as you have guessed, difficult and very hard on the bits.
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Ichan
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 « Reply #14 on: January 12, 2015, 03:56:31 15:56 »

I think you're correct in guessing it may work on ferrite. If it says "diamond" in it here, they rape you on the price, despite the bits being made from glued-on floor sweepings. Mind sharing where you got the bit shown, and the smaller diameter one for trimming the corners, speeds and feeds(if you remember what they were), as well as their cost? If so, please put that info in a text attachment, not out in the open.

It is not a natural made diamond, it is synthetic polycrystalline diamond (PCD) - many cutting tools these days coated with it.

I use single tool 4 mm flat bottom bit, the corner already acceptable for the eyes, spindle speed is 21K rpm and cutting speed 1500 mm/m, cutting depth is 1mm - water mist spray used to cool the tool and to suspend the dust. My previous attemp with 4 flutes carbide bit, blunt and blacken only on the first minute of cutting.

Attached a mediafire link to the diamond bits price list i got from china complete with pictures, also a short video of the ceramic tile cutting process.

Nice looking tile pattern, though...that must have scored you at least a month of bedroom passes

The art design worked out by other person and the G-Code generated by Vectric Aspire, not a single bedroom time was missed  .

-ichan
 « Last Edit: January 12, 2015, 04:02:17 16:02 by Ichan » Logged

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bigtoy
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 « Reply #15 on: January 16, 2015, 05:13:55 05:13 »

Ichan, that was a pretty interesting video. Nice setup you have there! And man, those cutting bits are cheap.
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Ichan
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 « Reply #16 on: January 16, 2015, 06:07:42 06:07 »

Attached the info where i buy cutting tools and other cnc parts, no other intention but sharing in here.

Well... pretty she is.

-ichan
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GroundPlaneLoop
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 « Reply #17 on: January 22, 2015, 04:28:57 16:28 »

Just some related info, I successfully cut a toroidal core with an diamond cutting wheel. Not the type for angle grinders for cutting stone, but this is more like a sheet metal circle about 0.5-1mm thick. on the circumference diamond powder is pressed into the steel. Its for underwater cutting of glass sheets.

The resulting gap was about 2mm, but the whole project was abandoned. Hall sensors from PC fans are not much linear.
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pickit2
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 « Reply #18 on: January 23, 2015, 10:55:56 10:55 »