3D Gimbaled Arm

3D Gimbaled Arm

Postby WntrMute » Sat Jan 06, 2018 8:05 pm

I have finally got Harry's custom arm installed. It is a 12 inch 3d job with the new gimbal bearing. I still need to tweak the tonearm lift and add some additional weight to the counter weight system but all in all, a nice piece of work!
20180106_144547_resized.jpg
20180106_144547_resized.jpg (971.1 KiB) Viewed 831 times


20180106_133935_resized.jpg
20180106_133935_resized.jpg (1.01 MiB) Viewed 831 times
User avatar
WntrMute
Senior Member
 
Posts: 555
Joined: Wed Aug 27, 2014 8:42 pm

Re: 3D Gimbaled Arm

Postby Gary1955 » Sun Jan 07, 2018 7:28 am

WntrMute, a Beautiful looking table and new arm! Congratulations!! I noticed in the first photo you have 3 round pads on the tonearm lift, but not on the second. I replaced the original tonearm lift mechanism on my HR-X table with a Jelco and had to add a small pad on the bottom of the tonearm to make contact with the lift riser mechanism. Were you able to adjust the tonearm to eliminate the need for those pads? I'm thinking about readjusting the set screw inside the bell housing to "lower" the arm to make contact?
VPI HR-X rim drive w/magnetic drive platter, 3D Ref. 12" tonearm, Lyra Titan-i cartridge, Graham Slee Reflex M & Elevator, tri-amped horn system w/electronic crossover, PrimaLuna Dialogue Premium preamp.
Gary1955
Senior Member
 
Posts: 506
Joined: Sun Sep 21, 2014 10:45 pm

Re: 3D Gimbaled Arm

Postby WntrMute » Sun Jan 07, 2018 12:04 pm

Gary1955 wrote:WntrMute, a Beautiful looking table and new arm! Congratulations!! I noticed in the first photo you have 3 round pads on the tonearm lift, but not on the second. I replaced the original tonearm lift mechanism on my HR-X table with a Jelco and had to add a small pad on the bottom of the tonearm to make contact with the lift riser mechanism. Were you able to adjust the tonearm to eliminate the need for those pads? I'm thinking about readjusting the set screw inside the bell housing to "lower" the arm to make contact?


Not yet. The lift mechanism seems to be functioning poorly. Takes forever to drop down and doesn't travel down far enough without finger pressure on the top of the mechanism.
Still working the problem.
User avatar
WntrMute
Senior Member
 
Posts: 555
Joined: Wed Aug 27, 2014 8:42 pm

Re: 3D Gimbaled Arm

Postby Gary1955 » Sun Jan 07, 2018 12:47 pm

I also had problems with the VPI's domestic made cuing lever on my new HR-X and ended up replacing it with a Jelco (Japan) assembly- works much better!
VPI HR-X rim drive w/magnetic drive platter, 3D Ref. 12" tonearm, Lyra Titan-i cartridge, Graham Slee Reflex M & Elevator, tri-amped horn system w/electronic crossover, PrimaLuna Dialogue Premium preamp.
Gary1955
Senior Member
 
Posts: 506
Joined: Sun Sep 21, 2014 10:45 pm

Re: 3D Gimbaled Arm

Postby WntrMute » Sun Jan 07, 2018 7:57 pm

I removed the cork pads on the lift arm. I then removed the same arm with a tiny philips screwdriver. Underneath was the hole for the tiny screw as well as a pin projecting downwards. I took a tiny brass washer (#4) and clipped one side off with a pair of wire cutters.
20180107_181959.jpg
20180107_181959.jpg (672.52 KiB) Viewed 732 times

The washer then was placed under the arm and re-secured with the tiny screw. Now, the apparatus works just fine. Lifts enough to clear the record and drops down with plenty of clearance to avoid fouling the tonearm at the runout groove. Perfect! Cost? NADA.
User avatar
WntrMute
Senior Member
 
Posts: 555
Joined: Wed Aug 27, 2014 8:42 pm

Re: 3D Gimbaled Arm

Postby Stringreen » Mon Jan 08, 2018 3:56 pm

I suspect the better way is to lower the arm on the bell housing.
Stringreen
Senior Member
 
Posts: 292
Joined: Wed Aug 27, 2014 10:27 am

Re: 3D Gimbaled Arm

Postby Stringreen » Mon Jan 08, 2018 3:58 pm

...just wondering how this new arm sounds compared to the 3D 2nd pivot.... Is there a way to adjust for azimuth on this arm?...very critical for good sound.
Stringreen
Senior Member
 
Posts: 292
Joined: Wed Aug 27, 2014 10:27 am

Re: 3D Gimbaled Arm

Postby WntrMute » Mon Jan 08, 2018 4:42 pm

I guess I didn't explain myself well. The lift mechanism would not lift high enough without the lever fouling the bracket. The washer effectively lengthened the portion above the mounting flange. Worked better than I expected.
HW built mine with azimuth adjustability.
User avatar
WntrMute
Senior Member
 
Posts: 555
Joined: Wed Aug 27, 2014 8:42 pm


Return to Harry's Corner

Who is online

Users browsing this forum: Baidu [Spider], Google [Bot] and 5 guests

x