Saturday, November 29, 2008

YSM35B Attaching Motor to Adapter

This is the ninth in the series of instructions on how to build the YSM35B Vibrating 35mm DOF Adapter. In the last part we reviewed the differences between the YSM35A and YSM35B. Now we attach the motor and power connector to the adapter itself.

Attaching Motor to Adapter

Parts and Tools needs for this portion:

Phono plug (RS 274-0852)
Soldering iron/gun
Silver bearing Solder (RS 64-025)
Eye protection

Wear safety glasses when operating the drill. Disassemble the static adapter from Ring #3 out. Leave Ring #2 attached to the F-mount. The motor mount area should be bottom. Note the alignment of the focus screen mount so the motor will become a fourth leg.

Take ring #2 on the adapter and mark out where you need to put the phono plug. It should be on the bottom and between the front and rear threads. Examine the ring inside and out before you drill.

Make a pilot hole with a 1/8" drill bit to start. This will take a few minutes of drilling. Rest your drill every so often. Then check to make sure your distances are alright. You shouldn't eat into the rear thread where ring #3 attaches or the front thread where the Nikon F-mount attaches.

Enlarge the hole with a 1/4" drill bit. This will be much quicker. Clean your work area of the aluminum dust.

Heat up your solder gun now. Meanwhile find your other phono plug. Remove the washer and middle/center conductor. Leave the spacer. Slot that onto the hole you made into ring #2. Attach the conductor to the threads on the phono plug from inside ring #2. Follow with the washer to fasten both together. The connector tab for the conductor should be facing inward.

Tin the back/center pole and the middle/outer conductor. Solder the red wire from the vibrating motor to the back/center pole. The blue wire goes to the middle/outer conductor. This should result in center of phono plug being positive and outer being negative. This matches the control box.

You can now re-assemble the vibrating mount, ring #2 and nikon F-mount together. To get the vibrating mount in you may have to insert it at a slant. Screw it all together via the found mount rather than rotating ring #2.

Re-align the right side stilt(leg) to the F-mount locking pin. Then remove the adhesive backing from the motor and press it on to the top focus screen mount.

During this endeavor the focus screen mount was probably displaced. Adjust the distance of the focus screen. Later we will glue the stilts so the distance is permanent. For now, just get it in the approximate distance. You might have to bend or loop the solid core wire so it doesn't bend the other legs. The adapter now has four legs.

Clean the focus screen. Hopefully you didn't touch it at all during this process. Attach the control box and test.

What's Next?
We finalize the vibrating adapter. We need to readjust for correct infinity focus. Once we are confident, we glue it to be permanent.

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