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Some info on broken gears cogs on the Magnavox D8443 and Aka


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#1 baddboybill

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Posted 01 June 2013 - 07:06 PM

Guys some info was passed to me by another member here and I have verified it to be true. The Magnavox D7140 and 7240 mono box has same cog gear but seams to be made little stronger than one in D8443. So not only do we have choice to buy the new manufactured one from VintageVolts but you can get the mono box for less than $20 and deck parts are almost 100% same minus motor, mono head and key covers :-)

#2 BoomboxLover48

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Posted 02 June 2013 - 05:48 AM

Good info Bill!



#3 superlew

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Posted 02 June 2013 - 06:10 AM

The deck issue with the gear is the reason I have continually shied away from the D8443.



#4 Alberto

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Posted 02 June 2013 - 06:19 AM

I'm glad you were able to locate one Bill.  :thumbsup:  They are hard to find. I found one a year ago and can't seem to locate another, but you did. :lol:



#5 baddboybill

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Posted 02 June 2013 - 08:58 AM

I'm glad you were able to locate one Bill. :thumbsup: They are hard to find. I found one a year ago and can't seem to locate another, but you did. :lol:


There actually a 7140 right now on eBay as well :thumbsup: Thanks for info Alberto ;-)

#6 Alberto

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Posted 04 June 2013 - 10:01 AM

Went looking for it on ebay, can't find it. Must be sold.



#7 baddboybill

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Posted 04 June 2013 - 10:13 AM

Went looking for it on ebay, can't find it. Must be sold.


I think it just ended with no buy the other day :yes: There's another member on S2G that I believe is also trying to make a gear. I know he made one for the Philips D8614 that is another problem gear :-)

#8 frontside5

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Posted 04 June 2013 - 10:21 AM

The deck issue with the gear is the reason I have continually shied away from the D8443.

 

Same.  There are so many it's tempting to get one to expand my new collection quickly.  Is the re & re straightforward on this unit?



#9 baddboybill

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Posted 04 June 2013 - 10:25 AM

Here are 3.....
http://www.ebay.com/itm/Vintage-Magnavox-AM-FM-Radio-Boombox-Tape-Player-model-D7140-/230986008916?pt=LH_DefaultDomain_0&hash=item35c7d6c954
http://www.ebay.com/itm/Magnavox-d7140-cassette-player-/130912277380?pt=Vintage_Electronics_R2&hash=item1e7afad384
http://www.ebay.com/itm/Magnavox-D7140-vintage-radio-cassette-deck-good-condition-working-order-/271206122146?pt=Vintage_Electronics_R2&hash=item3f252502a2

#10 Ghettoboom767

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Posted 10 June 2013 - 06:35 PM

I bet when I open mine up the cassette gear will probably be bad?!
All works but cassette on my 8443.
Thanks for the info Bill!:)

#11 Alberto

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Posted 03 July 2013 - 08:48 AM

Guys some info was passed to me by another member here and I have verified it to be true. The Magnavox D7140 and 7240 mono box has same cog gear but seams to be made little stronger than one in D8443. So not only do we have choice to buy the new manufactured one from VintageVolts but you can get the mono box for less than $20 and deck parts are almost 100% same minus motor, mono head and key covers :-)

 

The Magnavox I mentioned to you that had the stronger gear was the D7240. I also purchased a D7140 and it had the same crappy gear as the D8443. When I pulled the gear from the D7140 it came out ok, but crumbled in my hands. The gear from the D7240 must be made from a different material, it is much stronger and is still working well in my Magnavox D8443. It is the gear from the "D7240" that you want to get. :thumbsup:



#12 Jorge

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Posted 07 December 2017 - 12:52 PM

Bad news: D7240 does have the same gear but it is made from the same translucent crumbling plastic. By the year 2017 it got bad  :sad:



#13 Transistorized

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Posted 07 December 2017 - 03:09 PM

Wow. Great find there! Excellent. Always nice to be aware of workarounds when possible thumbs-up.gif



#14 Rimmer36

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Posted 07 December 2017 - 05:31 PM

Wouldn't buy any phillips for this reason



#15 JVC Floyd

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Posted 08 December 2017 - 06:01 AM

These gears are made of flexible plastic wtf lol. ALmost The whole deck is plastic.

#16 Trommelmops

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Posted 08 December 2017 - 06:50 AM

Is there anywhere a picture from the gear??????

 

Maybee i have some ideas.....But need more informations..... :yes:



#17 JVC Floyd

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Posted 08 December 2017 - 04:54 PM

This gear would be very hard to make because the outside teeth are angled.

#18 Jorge

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Posted 08 December 2017 - 08:25 PM

Here is how it looks inside D7240, still intact:

L1110685.jpg

 

and pulled out:

L1110690.jpg

 

With helical gears there is an extra step when 3D modeling, hope I will get the angle right:

L1110692.jpg

 

Hope someone beats me to it, refreshing AutoCAD skills is physically painful at my age!  :-/



#19 Trommelmops

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Posted 09 December 2017 - 02:39 AM

Ah ok.

I see the problems only in to digitalise

If I had all correct measurements it could be laser sintered.....like the gearwheels I made for superduper......

Is there anybody who has a broken gearwheel which Can send to me that I can digitalise it by myself? The material looks like the jelly from the gearwheel for the M90 function switch

#20 Trommelmops

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Posted 09 December 2017 - 04:30 AM

Little update:

 

I have contacted my network esp. my joker  :-D

 

If i had a wheel here, we would digitize it.... This is no challenge for us  :-) and after that

 

we would laser sinter some wheels....... :yes:

 

you need a little patience but the result is what count....



#21 Jorge

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Posted 09 December 2017 - 08:37 PM

What a relief! Fifteen years ago I actually had Fun using AutoCAD, nowadays its a struggle... Lets say that It got more complicated, not me getting slow'n'stupid :-)

I will gladly mail the gear to you: after spending a few weeks on restoring and re-painting Philips D8444 I "fell in love" with it!

Gear broke when I was GENTLY washing it off the goo with a paintbrush and mild detergent:

L1130023.jpg

 

L1130024.jpg

 

Is this going to be a problem? Hope not... 

PM me your address and I will mail it on Monday.



#22 baddboybill

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Posted 10 December 2017 - 12:12 AM

We had a couple people print the gear but the issue is it is a tiny bit smaller and grinds a little. Also because of this the Auto stop mechanism doesn’t work. Hopefully someone can rectify this issue.Attached File  8F5A6DD1-4195-45AD-95C8-0288291EF6EE.jpeg   60.95K   1 downloadsAttached File  B7056A4D-8DE8-4AEC-82D6-1082DCABACF2.jpeg   51.57K   1 downloads

#23 Jorge

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Posted 10 December 2017 - 01:37 PM

@BADDBOYBILL: photos a bit fuzzy. Am I right that it looks like this 3D printed gear here:
L1110129.jpg

I ordered these gears for Loewe Discman printed by shapeways.com. they have an option of "white strong & flexible polished" which looks like above. But if you pay an extra dollar and choose "frosted extreme detail" then the end result looks much better:
L1110130.jpg

Am I right that you already have 3D model of this gear??? :-)

#24 Trommelmops

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Posted 10 December 2017 - 03:50 PM

This interested me too. Is there any exist 3D model? 

 

When people have it already printed then they have constructed failures in the drawing.

 

When the size not fits then it is definitely not ok. Don't know the problem but it seems I make it completely new.

 

I'm convinced that it then fits. All the time and then this result......nothing what I would accept.....



#25 baddboybill

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Posted 11 December 2017 - 03:01 PM

@BADDBOYBILL: photos a bit fuzzy. Am I right that it looks like this 3D printed gear here:L1110129.jpg
I ordered these gears for Loewe Discman printed by shapeways.com. they have an option of "white strong & flexible polished" which looks like above. But if you pay an extra dollar and choose "frosted extreme detail" then the end result looks much better:L1110130.jpg
Am I right that you already have 3D model of this gear??? :-)


I don’t have any now. Not sure what else your asking me though about your pics?

This interested me too. Is there any exist 3D model? 
 
When people have it already printed then they have constructed failures in the drawing.
 
When the size not fits then it is definitely not ok. Don't know the problem but it seems I make it completely new.
 
I'm convinced that it then fits. All the time and then this result......nothing what I would accept.....


Sure would be nice to get exact size.

#26 Jorge

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Posted 11 December 2017 - 03:56 PM

BADDBOYBILL, thank you! You have answered the question. If you do not have any more gears or 3D computer model of this gear then we have to model and print it again  :sad: