Wednesday, October 24, 2012

Bridgeport Spindle Speeder Video's

A few articles ago I described a special attachment for a standard milling machine that increased the spindle speed up to 25K RPM. I was missing one of the small cross section v-belts to make the unit run. The ordered belts came to the shop today so I put it all together and ran it for the first time in ten or twelve years. As promised there is some video footage at the end.
Attaching the pulley support to the end of the quill housing. It clamps to the housing with a single screw.
Ready to add the belts. In this picture I loaded up the little ER-8 collet setup. The kit has another tool holder that has a small sensitive hand feed drill chuck.
Belts installed and ready to shoot some video of the speeder in action. My tachometer only goes up to twelve thousand rpm so that is what you will see in the video's.
A nice short one of the speeder running at low speed.
A little longer one with some tachometer readings.
A run up of the speeder to twelve thousand rpm. Speed of the milling machine spindle is only at fourteen hundred rpm. A link to the original article.


  1. Fantastically elegant spindle speed multiplier. Nice to see it "fired up" after all those years.

    Have just finished your book (Sink or Swim). I found it most useful and well written.

    However, must disagree with the section on the metric system. Most imperial rules/scales are marked in fractions other than decimal (quarters, eighths, sixteenths, thirthyseconds etc.). But the main argument for the SI system is standardisation (I believe Joseph Whitworth would agree) and trade (international), as there are only now three countries in the world that now use the imperial system.

    Most excellent blog by the way. Will be visiting here often.

    All the best from the UK/Great Britain.

  2. Hi Map,

    Thanks for the reply. You have the honor of the first non spam comment to this blog. I don’t necessarily disagree with you about the metric system. My comments in Sink Or Swim were mainly to point out that for manufacturing it is irrelevant which system we use. So here is a little challenge for you. Whenever folks start talking about the advantages of the metric system versus the imperial system they throw up that the metric system is base ten so its “easier”. So the challenge is to tell me your height in nanometers right now without looking anything up or writing anything down on paper. If you got it good for you. How about your body temperature in degrees Kelvin? The point I’m trying to illustrate is that I think it’s a units and conversion problem and always has been. The SI system is superior for conversions but manufacturing has little to gain from changing over.

    Think about it from this perspective. You are a manufacturing company in the United States and the government comes by one day and says that you have to start using the metric system right now. All your products and materials must comply. Ok so what happens now. I’m pretty sure this change will not happen for free. I won’t be able to charge more for my products because they are metric. The government is not even helping me to make the change. The net effect is my overhead just went way up with no real end in sight and no payback on the investment. If a bank told you suddenly that they were adding a large metric implementation fee to your deposit accounts and that you were not allowed to close the account and withdraw your money how would you react? With no payback on the infrastructure investment the metric system is like throwing your money away. So what is my motivation to change? To be a nice guy and do the right thing for the world? That’s fine for the likes of HP and Apple with billions of dollars throw at the problem. And they didn’t make the switch in even a dozen years.

    The UK government even had to make some concessions on certain units when they made the change. What would have happened if they ditched the “pint” and went to some metric equivalent?
    It’s been fun discussing the metric system. Thanks for the comment and reading the blog.
    Kind regards.
    Tom Lipton