I suspect that something is happening inside the motor itself that causes it to deteriorate. On the defective motors, we checked the windings (on a meter and by "ringing"), and no defects were noted. We did a minor service on this motor, installed it, and after a few months it was back with that same symptom. I was even able to purchase a NOS Garrard motor from a dealer who was selling off his audio parts inventory. We do the standard disassemble, clean and lube, and they exhibit an intermittent low-torque, unstable-speed symptom. We've run into about a dozen bad Garrard motors in the last two years. Not the excellent synchronous Zero-100 motors (although you sometimes have to glue the magnet back onto the rotor.) No, the cheaper ones used on, for example, the turntables in the KLH Twenty and Twenty-Four. What is really a drag is that Garrard motors are dying. (Customers wanted Dual 1219 or Garrard Zero-100 accuracy with their $49 BSR.) I began that practice back in the 1970's, because BSR's were never right on the money even when new. I have a disclaimer form I ask them to sign where they agree to accept the post-service speed that the turntable yields, so long as it's not way off. They want the $200 service for about $75. He has a large library of specs on diameters.Īs you know, there is a problem with some customers.
I think at some point he may have come across a NOS two-tiered idler and measured it with his vernier calipers. Since Terry Witt is actually a machinist, he can get it down to about a mill. "Accept the fact that some days you are the pigeon, and some days you are the statue." I like to keep things nice & simple and just replace the defective parts and be done with it. Yes, sometimes they can be turned down, but both sections have to be done in the proper ratio or it's useless. Repairing audio gear since the Pleistoceneīut of course you know, Fred, that those 2-step idlers are critical in diameter for the proper speed ratio. If you have the right gauge mandrel, you can use a power drill or the Dremel tool. Sometimes if the defects are shallow, and the rubber is still good, you can resurface the idler wheel on a piece of, say, #1000 sandpaper, turning it in small increments so that the grinding-down process is even.
However, he charges $35 plus $5 shipping, so if the idler needs to be rebuilt that takes the repair immediately out of the "budget" category. Terry's Rubber Rollers (Terry Witt) rebuilds them very well. So, the idler develops a flat or a ding on the rim. Alas, many vintage turntables haven't been played for many years, or are gummed up. I'm sure that many designers rationalized this by assuming that every time the idler stopped turning, it would stop in a different spot, and would never be in the OFF position for long. Print Charts, Flip.World, HTML Spirograph.Idlers that don't retract when the set is off - or idlers that should retract, but don't, usually because something is gummed up - are a perennial problem. Benefiting from an impressively low trigger speed of 0.3 and 1.0 recovery mode, you can easily capture that prey in action, day and night. It’s easy to navigate and simple to setup.
Gear Generator How to Draw Perfect Gears (4:23) The Bushnell Trophy Cam E3 is a robust and dependable wildlife trail camera that produces bright and colorful pictures and is easy to program and operate.
Update 1.4: TA-DA: Added internal gear support, and the ability of positioning the first gear. Maximum number of teeth increased to 400. The downloaded DXF file can be opened with AutoCad 2013 or newer versions. The winners are: Opera for the best performance (shame on me, I never use it) and Firefox for the best looking SVG render. Support: about browser compatibility: all new major browsers are supported (i didn't tested IE), but unfortunately Chrome can't render SVG circle correctly.
It was a pleasure to code the whole thing, I'm a bit sad it is already done. As it was done, I couldn't stop, and I added more and more features, and finally I got this tool. I'm working on a hobby project, a scale construction machine, which needed some spur gears, and I quickly made a simple spur gear creator script in Javascript with SVG output. Gears can be animated with various speed to demonstrate working mechanism.
In addition it let you compose full gear layouts with connetcted gears to design multiple gears system with control of the input/output ratio and rotation speed. Gear Generator is a tool for creating involute spur gears and download them in DXF or SVG format.