The mundane mechanical assembly.
Posted: Fri Jul 11, 2014 9:00 am
A couple of things;
1) Insertion of ALL THOSE 6/32 nylock nuts.
I found this tricky to say the least and hard on the thumbs and forefingers.
They have to go in with a nut point leading (obviously).
Needle nosed pliers and hemostats denied me the "feel" to know that the axis of the nut was aligned to where the screw's axis would eventually be.
Tip;
Unpack one of the 2 in long 6/32 screws, use it as an insertion tool.
Thread each nut onto it until the nylon just grabs it.
Align the nut to the pocket, spin the screw to align the nut's flats, press it in.
Feel that the nut's points protrude the same amount on each side of the melamine.
Straighten the screw in the slot for fore/aft and side to side.
Remove screw, proceed to next nut, etc.
You should have confidence that the screw will find the nut when you do the assembly and should NOT cross thread.
2) Cheapskate bearings and bearing sleeves.
I had difficulty getting a bearing to balance evenly in a sleeve, put another sleeve on top and then press them together on a table.
Motorcycle repair experience suggested that the bearing needed to go in the freezer and the sleeve needed to go in the oven (-:
Tip;
This worked for me, it might work for others.
I held maybe 5 or 6 of the sleeves in my closed fist for 1/2 minute or so.
Picked up a bearing, selected the sleeve closest to my palm and slipped it on with forefingers and thumbs - quite a bit easier.
Selected the next sleeve deepest in my palm, snapped it onto the other side, done.
Not sure if this is due to thermal expansion and/or softening of the plastic - almost certainly not due to hand sweat, or "palm oil" (-:
Point is, it worked.
3) Assembling tower supports and Mounting the motors.
I left it too late to get Astrosyn dampers, but got some isolating gaskets.
Since I didn't know just how far these would compress I left the drive pulleys off until the assembly was almost complete.
I also put 1/8 inch rubber grommets under the heads of the motor mounting screws to isolate the screw heads from the melamine.
No idea how well this will work, but it cost me a dozen M3 x 0.5 x 16mm stainless screws - the kit ones are 10mm.
I also used M3 "fender washers" between the screw heads and grommets.
Tip;
I inserted the screws for the idler pulleys from the OPPOSITE side, not the motor mount plate.
Basically my small philips screwdrivers are too short to use that close to the motors.
I held the nuts with a hand held (I didn't want too much torque) 5/16 socket, no ratchet handle.
Since I had introduced a new variable with the vibration isolation gasket the drive pulleys could not be mounted flush at the ends of the shafts.
To get the pulleys aligned "right" I aligned them to the idler bearings once the rest of the assembly was together.
Tip;
Do this by squinting along the idler bearings in a direct line such that you can see the same amount of space between the bearing and the spacers on the left and right - align the drive pulley to the bearing.
4) Cheapskate assembly and adjustment.
As a general principle I dislike the idea of assembling or setting things up "in mid air", so I assembled and adjusted my cheapskates "on the bench", not "around the towers".
I assembled them FULLY, laid them on the side that has the fixed bearing spacers and used a tower extrusion as my "feeler gauge" to adjust the eccentrics, which were "on top".
Obviously this was out of sequence, I hadn't run wires through the tower extrusions or mounted them.
I think this has a better chance of controlling assembly errors than assembling and adjusting them "around the towers".
1) Insertion of ALL THOSE 6/32 nylock nuts.
I found this tricky to say the least and hard on the thumbs and forefingers.
They have to go in with a nut point leading (obviously).
Needle nosed pliers and hemostats denied me the "feel" to know that the axis of the nut was aligned to where the screw's axis would eventually be.
Tip;
Unpack one of the 2 in long 6/32 screws, use it as an insertion tool.
Thread each nut onto it until the nylon just grabs it.
Align the nut to the pocket, spin the screw to align the nut's flats, press it in.
Feel that the nut's points protrude the same amount on each side of the melamine.
Straighten the screw in the slot for fore/aft and side to side.
Remove screw, proceed to next nut, etc.
You should have confidence that the screw will find the nut when you do the assembly and should NOT cross thread.
2) Cheapskate bearings and bearing sleeves.
I had difficulty getting a bearing to balance evenly in a sleeve, put another sleeve on top and then press them together on a table.
Motorcycle repair experience suggested that the bearing needed to go in the freezer and the sleeve needed to go in the oven (-:
Tip;
This worked for me, it might work for others.
I held maybe 5 or 6 of the sleeves in my closed fist for 1/2 minute or so.
Picked up a bearing, selected the sleeve closest to my palm and slipped it on with forefingers and thumbs - quite a bit easier.
Selected the next sleeve deepest in my palm, snapped it onto the other side, done.
Not sure if this is due to thermal expansion and/or softening of the plastic - almost certainly not due to hand sweat, or "palm oil" (-:
Point is, it worked.
3) Assembling tower supports and Mounting the motors.
I left it too late to get Astrosyn dampers, but got some isolating gaskets.
Since I didn't know just how far these would compress I left the drive pulleys off until the assembly was almost complete.
I also put 1/8 inch rubber grommets under the heads of the motor mounting screws to isolate the screw heads from the melamine.
No idea how well this will work, but it cost me a dozen M3 x 0.5 x 16mm stainless screws - the kit ones are 10mm.
I also used M3 "fender washers" between the screw heads and grommets.
Tip;
I inserted the screws for the idler pulleys from the OPPOSITE side, not the motor mount plate.
Basically my small philips screwdrivers are too short to use that close to the motors.
I held the nuts with a hand held (I didn't want too much torque) 5/16 socket, no ratchet handle.
Since I had introduced a new variable with the vibration isolation gasket the drive pulleys could not be mounted flush at the ends of the shafts.
To get the pulleys aligned "right" I aligned them to the idler bearings once the rest of the assembly was together.
Tip;
Do this by squinting along the idler bearings in a direct line such that you can see the same amount of space between the bearing and the spacers on the left and right - align the drive pulley to the bearing.
4) Cheapskate assembly and adjustment.
As a general principle I dislike the idea of assembling or setting things up "in mid air", so I assembled and adjusted my cheapskates "on the bench", not "around the towers".
I assembled them FULLY, laid them on the side that has the fixed bearing spacers and used a tower extrusion as my "feeler gauge" to adjust the eccentrics, which were "on top".
Obviously this was out of sequence, I hadn't run wires through the tower extrusions or mounted them.
I think this has a better chance of controlling assembly errors than assembling and adjusting them "around the towers".