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Old Yesterday, 10:54 PM   #3491
warrjon is online now warrjon  Australia
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Join Date: Feb 2011
Location: Terang Vic
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Originally Posted by dahlberg View Post
When you say "polished to one micron", does that mean that you went from ???? down to 1micron diamond lapping paste ? And how did you manage this ?
I started with fine valve lapping paste, used to lap engine valves. I then polished with 5 micron down to 1 micron diamond paste. I spent a lot of time with the 5um to get the scoring out from the valve paste. To polish I used toothpicks with the point slightly sanded and used them in a cordless drill.
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Last edited by warrjon; Yesterday at 11:11 PM.
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Old Yesterday, 11:10 PM   #3492
warrjon is online now warrjon  Australia
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I hate doing jobs twice. I drilled the holes for the wheels too low making the cartridge mounting surface 3mm too high. So I need to make another carriage. Oh well.......
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SP10, ...... DIY Linear tonearm, ......Stanton 881s with D3000 stylus, .....BHL phono,.........Pass B1,
MODULUS 86 power amps x4,.............Active line level OX,......... bi-amped OB speakers with Mark Audio Alpair 12P
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Old Today, 01:09 AM   #3493
hjam is offline hjam  Canada
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Join Date: Mar 2012
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Originally Posted by warrjon View Post
Hi hjam


that fixture is an ER32 collet block held in a 4 jaw chuck. Can be bought from eBay for about $40.
.
Thanks warrjon!
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Old Today, 06:47 AM   #3494
dahlberg is online now dahlberg  Sweden
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Join Date: Jan 2005
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Originally Posted by warrjon View Post
I hate doing jobs twice. I drilled the holes for the wheels too low making the cartridge mounting surface 3mm too high. So I need to make another carriage. Oh well.......
Looks like a carbon fiber/styrofoam sandwich, right ?
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Old Today, 06:59 AM   #3495
warrjon is online now warrjon  Australia
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Join Date: Feb 2011
Location: Terang Vic
0.5mm carbon fibre with 3mm balsa core. It's pretty rigid as it is so when I get the under tray added it should hold up the house.

Look on the bright side - this time i will get everything more symmetrical. I made the frog (as my wife calls it) and machined it rectangular and the reference point this time will be the polycarbonate.
.
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SP10, ...... DIY Linear tonearm, ......Stanton 881s with D3000 stylus, .....BHL phono,.........Pass B1,
MODULUS 86 power amps x4,.............Active line level OX,......... bi-amped OB speakers with Mark Audio Alpair 12P
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Old Today, 07:22 AM   #3496
nocdplz is online now nocdplz
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Join Date: May 2010
Location: italy
..."polished to one micron"...
then Mr Micron really exist: even alone, even for diy machinists: I thought they traveled only in good company, calling them affectionately cents and so on - I will have to resign myself to that sparkling evidence :-)

Rings. ah, perfect for a wedding with their wheels. I wondered how that section could be turned and parted (in tungsten carbide!) - a very special, custom shaped tool? diamond grinding on a special support after parting? what a dumb, to buy them is much simpler.
Beyond jokes, great job Warren; but why to redo that nice, lightweight carriage? can't understand: i like frogs, even those crushed by a truck

carlo
for a word of comfort, always ask your wife..

Last edited by nocdplz; Today at 07:26 AM.
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