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Old 29th January 2014, 05:52 PM   #1
diyAudio Member
 
Join Date: Apr 2007
Location: Glyfada/Athens
Default My new effort on making the ultimate DP-80

About four years ago i have posted my previous effort in transforming
the legendary DENON DP-80 DD turntable of the eighties into a completely modern shape.
You can see my effort then in the pic below and of course in the "Monsterizing a Denon DP-80" thread.
This was made for a friend living nearby, has kept it's ground proudly
these four years as it's been used regularly, working without a single glitch.

That thread has been touching people's imagination about the ways a
first rate DD table can be transformed.
I have been receiving emails and PM's all this time from people all around the world, wanting to do the same or asking info about how to obtain one.
Since then many DP's have passed through my hands and i have puzzled
my mind about better ways to use this wonderful motor/platter.

Now it's time to post about another effort on the same subject.
This time i had a "carte blanche" on making my absolute best.
I have decided on a better looking shape with differences in metals,
a half size external PSU with all the transformers and modified electronic
boards, modifications in the spindle and thrust plate,modifications in the
split platter construction, an extra metal mat, a custom record weight and
a custom periphery ring.
All these had to mate with a Kuzma 4P tonearm placed on a separate
custom tonearm base...
I did not have the arm in my hands but i have received directly from Frank Kuzma all the relative measurements and specs.
Let's hope i will not mess things up!
Attached Images
File Type: jpg w4-Optimized.jpg (38.7 KB, 831 views)
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Old 29th January 2014, 06:19 PM   #2
Dyolf is offline Dyolf  Norway
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Looking foreward to this. I was mighty impressed with your last build, and like before, we do like pictures.
Steen
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Old 29th January 2014, 06:32 PM   #3
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Don't worry...there will be plenty of them!
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Old 30th January 2014, 05:05 PM   #4
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As always, i start with sketches on paper and then make the designs in the computer.
I start with simple designs to see the height,thickness and relative position of the main
pieces with regards to the actual measurements of the original transport.
I will not describe again how a stand-alone DP-80 looks...please refer to the old thread
for this...
Chassis wise...my aim this time was to make it even more streamlined and to create a form that would look elegant regardless of the actual mass of the final unit.
I had decided to use different metals and strategically placed damping agents in an effort to create a chassis that would not impose a sonic character on the sound.
Modifications wise...I have had a great number of DPs passing through my hands for repairs and modifications and when you do this you find very easy to point at the areas that the original can be bettered.
So you can say that i had a set of very fixed ideas about what i would do with this one.
PS:You have to speak greek to understand the last one...it was part of my back and forth discussion with the CNC guys.
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Last edited by soundofvoid; 30th January 2014 at 05:07 PM.
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Old 31st January 2014, 11:43 AM   #5
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All these scetches were forwarded to a friend who does my CNC CAD files.
We have talked about metal options and weight distribution and each metal's
damping characteristics.
I have decided on a chassis made from machined slabs of softer grade aluminium and leaded iron.
The legs would be cut from a harder grade of aluminium.
These would be hollow in order to create a chamber for lead shot.
The chamber would be permanently closed with a solid disc of bronze that would also serve as a screwing ground for the inox steel spikes.
These would fit into "raised" cups (inox steel) that would provide a streamlined look.
As you see a number of six different metals was used to make sure that each ones sonic character would be counteracted by the others.
Of course i have left space in the design for elastic/damping sheets that would act as flanges to tame down even more the transmission of energy from one metal to the other.
I have used sorbothane, soft grade of silicone, silicone foam and rubber foam.
Attached Images
File Type: jpg final design01.jpg (32.0 KB, 664 views)
File Type: jpg final design02.jpg (31.3 KB, 73 views)
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Old 3rd February 2014, 10:23 AM   #6
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After the metals were ordered, the CNC shop took on.
Unfortunately i do not have access to a 5 axis unit, so some parts of the work
had to be done manually...
I'm used to getting dirty...and this is diyaudio after all!
So after some time the parts that form the main part of the chassis were ready.
With long M10(metric) bolts all were screwed together to form a nice heavy "bowl" for the DP-80.
You can see that it is formed by two parts leaded iron and three parts aluminium.
It's about 28 kilos in this part only.
Attached Images
File Type: jpg Photo0491-Optimized.jpg (65.5 KB, 185 views)
File Type: jpg DSCN1369-Optimized.jpg (65.1 KB, 200 views)
File Type: jpg DSCN1370-Optimized.jpg (98.7 KB, 186 views)
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Old 4th February 2014, 10:56 AM   #7
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The three supporting legs were cut from hard billet aluminium.
Their slanted top follows the angled shape of the top of the turntable.
Recesses have been cut into their attaching surface for press-fit flange material.
My design was for a hollow form with bronze "bottoms".
Previous tests have shown me that you get a lot of damping with lead shot
and thick gearbox oil and so i have designed an o-ring recess to keep that oil in.
Each leg ends on inox steel spikes and cups.
The cups have raised periphery to completely cover the spikes for a more streamlined look.
Attached Images
File Type: jpg DSCN1363-Optimized.jpg (67.9 KB, 163 views)
File Type: jpg DSCN1364-Optimized.jpg (41.2 KB, 115 views)
File Type: jpg DSCN1366-Optimized.jpg (46.1 KB, 111 views)
File Type: jpg DP-80 bronze parts spikes and cups-Optimized.jpg (75.9 KB, 122 views)
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Last edited by soundofvoid; 4th February 2014 at 10:58 AM.
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Old 5th February 2014, 09:25 AM   #8
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All these were bolted together so that i could take a look at the actual shape of the design.
Each 'leg" is bolted with three M8 screws to the aluminium parts of the chassis.
The screws are inserted from the inside of the chassis and are tailor cut because different exact lengths are needed.
The bronze discs will be press-fitted and glued to the underside of the legs.
The formed chamber will be filled with lead shot and thick oil through the hole that the spikes screw on.
The spikes will be tightened against the o-ring that is captured between the two metals.
The thick o-ring will also act as a damping agent.
The weight of the whole thing (with empty chambers) is 35 kilos.
Impressions so far?
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Old 7th February 2014, 08:56 AM   #9
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It seems that too many people are trying to make another "perfect" DAC...
Anyway...i 'll keep posting...

In the meantime my long distance audio friend was trying to decide on the tonearm
that he was going to use.
The selection was between a SME V, a SME 12" and a Kuzma 4Point.
After some discussions he has decided on the 10" Kuzma.
The DP-80's own chassis is wide,then there is another cm of metal that encloses it, and the arm has to have a collar around it's pivot point...
All that made things difficult for placing the arm on an stand alone external pillar.
It being a 10" arm was not helping much due to the way the arm is made to fit the place of a 9" one.
Frank Kuzma has sent me all the files regarding the positioning of the arm
and also an original collar so that i could make some measurements.
I decided to make my own collar so that i could escape some limitations.
I made several designs around a central idea as i wanted it to look good
except being sturdy...
My CAD guy produced the final files and we were ready for cutting the metals.
Attached Images
File Type: jpg tonearm base.JPG (38.0 KB, 138 views)
File Type: jpg Top plate (FILEminimizer).jpg (21.0 KB, 50 views)
File Type: jpg Tonearm tower top plate (FILEminimizer).jpg (30.3 KB, 48 views)
File Type: jpg with bracket02.jpg (31.8 KB, 47 views)
File Type: jpg with bracket03.jpg (43.7 KB, 45 views)
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Old 8th February 2014, 09:09 AM   #10
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The tonearm base was made from parts out of different metals again.
I used inox steel for the lower section, leaded iron for the middle part and aluminium
for the top part.
The new collar for the Kuzma was from aluminium.
The middle part was hollow to accept lead shot and oil and sorbothane flanges were
employed to damp resonances even more.
It's weight was 6.5 kilos with the chamber empty and i expect something in the range of 12 kilos with it filled.
The whole thing is to be kept together by a single long countersunk M10 bolt that enters from the bottom,penetrates all the parts and screws on the top plate.
My logo and the arm for which this is made were CNC engraved on the top.
If a new arm is needed i just have to cut a new top plate.
All nice and neat.
Attached Images
File Type: jpg Photo0428-Optimized.jpg (91.9 KB, 79 views)
File Type: jpg Photo0424-Optimized.jpg (119.6 KB, 74 views)
File Type: jpg Photo0423-Optimized.jpg (105.6 KB, 65 views)
File Type: jpg Photo0420-Optimized.jpg (102.5 KB, 83 views)
File Type: jpg Photo0421-Optimized.jpg (81.8 KB, 80 views)
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Last edited by soundofvoid; 8th February 2014 at 09:17 AM.
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