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The Incredible Technics SP-10 Thread
The Incredible Technics SP-10 Thread
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Old 27th December 2020, 05:31 PM   #1681
BrianL is offline BrianL  United States
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The Incredible Technics SP-10 Thread
Impressive. How many turns of what gauge wire did it take?
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Old 27th December 2020, 06:57 PM   #1682
Pitrus is offline Pitrus  Italy
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Quote:
Originally Posted by warrjon View Post
My spare SP10 motor developed an issue, on dismantling it I found one of the FG wires had broken. The only solution was to rewind the FG.

Here are a couple of pics of the FG apart and the rewound coils. The last pic is the motor ready for re-assembly.

Period adjusted and working perfectly. BTW for anyone adjusting the mk2 VR101 and VR102 need to be adjusted then re-checked as VR101 will effect 78RPM and vice-versa.

December 27, 2020 - YouTube
good job really....I managed to avoid complete disassembly by soldering micro copper wires at the base of the break after removing the enamel with sandpaper attached to a toothpick; a surgical operation and very delicate having broken 3 wires out of four and only one possibility of repair because if only one of the wires was broken I was with my butt on the ground.

A few drops of insulating paint around the welds and a few drops of melted wax to softly fix the wires at the coil exit as in origin; I finally completely restored the speedometer coil.



before

Click the image to open in full size.





after

Click the image to open in full size.






Click the image to open in full size.

Last edited by Pitrus; 27th December 2020 at 07:07 PM.
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Old 28th December 2020, 02:51 AM   #1683
warrjon is offline warrjon  Australia
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Default Stainless Platter update

As many of you will be aware I made 2 Stainless Steel platters one for myself and another for Bon. The one I made for Bon did not quite fit in his plinth I had to put and undercut so it would sit down. Bon gave me one of his old plinths to test fit. So before I ship the platter to him I thought I would do an impulse response test. All tests were done on the unit in pic 1.

Why do a IR test - a TT is a very sensitive vibrometer any resonance in the system however small will modulate onto the audio signal causing a loss of detail in the output (smearing the audio signal).

As can be seen from the scope trace the SS/Delrin platter does an excellent job of damping resonance. It will be interesting to hear Bon's evaluation of this SS/Delrin plattered mk2 against his SP10R.

A description of the pics in order.

Bon's Stainless/Delrin platter in the plinth he gave me.
Impulse response
OEM platter.
My SS platter, designed to fit stock SP10 chassis.
Bon's SS/Delrin platter 19mm thick stainless with 16mm Delrin fixed to the top. NOTE this platter will not fit a stock SP10 chassis.

.
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File Type: jpg Impulse-OEM.jpg (980.4 KB, 180 views)
File Type: jpg Impulse-SS.jpg (873.9 KB, 49 views)
File Type: jpg Impulse-SS-Delrin.jpg (975.9 KB, 49 views)
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Old 13th January 2021, 02:39 AM   #1684
warrjon is offline warrjon  Australia
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Guess what this is........

Ok - is's the insert to cast a Gunmetal platter. I'm going to get this organised tomorrow.
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Old 14th January 2021, 04:25 AM   #1685
donhughes111 is offline donhughes111
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Default platter

So, are you thinking gunmetal and delrin to fit a stock SP-10 chassis?
Don
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Old 14th January 2021, 05:58 AM   #1686
warrjon is offline warrjon  Australia
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Yes, it will fit a stock SP10 chassis. Bon's platter was a special order to fit his SP10mk2 Kaneta.

I've have ordered 2 GunMetal blanks and I have some 10mm Delrin. The plan is to make one with and one without Delrin to test the difference. I suspect the Delrin will be better. I will test all 3 platters SS, GM and GM/Delrin.

One of the benefits of the bonded Delrin is flatness of the LP surface which should be better than almost any mat. Bon's platter after a final face measured better than 0.02mm total vertical runout. The motor had more than 10 times this runout.

If the GM is at least as good as the Stainless I will offer these to DIY members as the machining will be much easier. My cost will be about the same as the GM blank will be more expensive but the SS was a PITA to machine and ate tooling and took me 5 days to machine Bon's platter. Drilling the bolt holes in the SS for the Delrin was a nightmare.
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Old 14th January 2021, 12:02 PM   #1687
donhughes111 is offline donhughes111
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Really great to see you do this. Thank you.
Don
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Old Yesterday, 07:51 AM   #1688
warrjon is offline warrjon  Australia
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Default Motor spindle repair

This is the motor that i rewound the FG coil on. When I assembled it I found the spindle had a very small amount of play. Running the motor the vertical runout was quite bad at 0.5mm.

So in my usual fashion I decided to modify the rotor and insert a brass collar. The rotor was drilled then bored 10mm and the brass was machined for a 0.02mm press fit. I then drilled and bored the brass for a 0.02mm press fit. The spindle is then pressed in. Finally I used the toolpost grinder to grind the platter mounting flange true to the spindle. Checked runout in the lathe and less than 0.01mm TIR. Pretty happy with that.

When I mounted the platter and checked runout it was 0.1mm which is 1/2 what my other SP10 is. I suspect this runout is in the bearing. Next upgrade is to machine PTFE bushes for the spindle.
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Old Yesterday, 03:24 PM   #1689
JP is offline JP  United States
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Nice.
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