Rescuing an Old Friend

 Many of my readers are involved in my "real" life and know that just last Wednesday, I retired from Lancaster Church of the Brethren after 17 years as their Director of Music. For all of that time, and for some years before taking that job, I used my folding microphone stand to record various concerts and events, and it saw weekly duty during the pandemic while I recorded video and audio for our online services.

As I was cleaning out my office, I was folding up my old stand one last time to take it home, and the aluminum base that holds the folding legs shattered, dropping several pieces at my feet. It was almost as if it said, "If you're done, then I'm done too!"

Twelve Volts, Cheap

When I was working on the Volvo M41 overdrive transmission as documented in the Beck TD blog posts (Parts 51 through 57), I had need of a power supply that supplied a LOT of current - 20 to 25 amps at a nominal 12 volts - to actuate the solenoid that made the overdrive engage. To get there, I just used the battery from the car, which worked great but is an obvious inconvenience to remove and carry over to the workbench. I resolved to find a better solution...

Mounting a Drill Press Vise

 Work has been kind of crazy-making lately (blame Covid-19), so I wanted to make best use of a rare full day in the shop today, plus a couple of hours yesterday. I set these parameters for a quick project:

1. Make something that would be useful in the shop.
2. Finish in about a day or less.
3. Make something that, if I messed it up, would be absolutely inconsequential - I was trying to decrease stress, not increase it!

Too Many Indicators!

There is a thing called Segal's Law which states, "A man with one watch knows what time it is. A man with two watches is never sure." It's about the limits of certainty when measuring, and also a caution about trusting an instrument without verification. That Wikipedia link has some really daunting math to back it up.

Well, while quarantined by COVID-19, what better time to check various test indicators to see what I have? And I actually had a good reason: my Sherline lathe is not giving a great finish to the cuts, and I wanted to test it out. I gathered up four different indicators to get a consensus measurement.

A Beginner's Welding Table

Fair warning... if you are looking for expert advice on how a beginner can create a welding table, move along - nothing for you here. This is the chronicle of how a beginner created his first homemade welding table. That's a long tradition. Woodworkers make their own tool boxes and workbenches in the course of learning their craft, and welders weld up their own welding tables and welder carts as part of the initial practice.

Beck TD, Part 53: A Special Transmission Tool

I've been enjoying this project to rebuild an antique Volvo M41 transmission - it has been quite the learning experience. The M41 is an overdrive transmission, and that is a very different beast from the M40 trans that I recently rebuilt. One of the interesting aspects is that the overdrive shift action is done with hydraulics at very high pressure (over 500 PSI), using an oil pump built into the overdrive unit.

Of course, when you're rebuilding, you want to inspect and repair that high-pressure pump, and it turns out it has a part that requires a special tool to remove. It's called the "non-return body" and it's down in the bottom of a hole. This photo is a bit hard to read, but you can see the non-return body at the bottom of the hole, and the part itself is shown in the inset at the top right. It's not a normal hex head. Instead, it is sort of an oval with flat sides:

More on the "Very Specific Jack"

In my last post (link) I detailed the creation of a "very specific jack" to use with my new ER32 Spin Indexer (link). Its mission in life is to support the far end of stock mounted in the indexer, far above the milling machine's table. Here's a photo:

A Very Specific Jack

I recently posted about an addition to the machine shop equipment at the Grant Street Garage: an ER32 Spin Indexer (link). In response to that post, my friend Jake pointed out that I should have something at the far end of the work in the indexer to keep it from flexing, lest I get inaccurate or inconsistent results. Even a large rod can flex a few thousandths of an inch with just fingertip pressure. This photo makes the issue clear:

The ER32 Spin Indexer

Wow, if you even made it past the title of this geeky machinist post, you must be pretty interested in machine work! A spin indexer is a useful tool that lets you precisely locate round stock in a milling machine, and rotate it very accurately in one degree increments.  This photo shows the indexing wheel that has holes every 10 degrees, and the 10 offset holes that bring it down to one-degree increments. There's a pin, not shown, that locks the rotation at the desired setting.

A Mildly Embarrassing Repair

It was back in 2016 when I received a used Sherline lathe for Christmas. Click here for the post announcing that addition to the shop. Here's a photo from that post:

Gloriously Inconsequential

Rob Siegel is an automotive writer that goes by the self-chosen appellation "The Hack Mechanic," and he is a funny guy as well as a good mechanic. In a recent column in Roundel, the magazine of the BMW Car Club of America, Siegel got philosophical for a bit, and explored the reasons that car people, as well as other hobbyists, get so passionate and consumed with their hobbies. One reason is that the decisions involved can be "gloriously inconsequential" - they can consume a lot of time and energy (all of it fun in some way) but the decisions have no real bearing on real life.

Today I got a rare full day in the shop at Grant Street, and did some work on something that certainly qualifies as inconsequential, glorious or not. In addition to the shop full of tools at Grant Street, I maintain something I've started calling The Corner Machine Shop, because it occupies a corner in our garage at home:

John's Power Steering Pump

John Zimmerman, along with his son Bob, is in the home stretch of a long restoration of his Buick Riviera, which he has owned since the mid-60's. A couple of weeks ago, it finally returned to Bob's shop with a show-quality paint job by Horsepower Enterprises in Lancaster.

Make717: Milling a Square or Hex on Round Stock

Fair warning: this post is to document a specific procedure for members of Make717. Regular subscribers don't need to feel guilty for skipping it!

MAKERS: the machine shop at Make717 has all you need to easily mill square or hexagonal shapes on round stock. This before-and-after photo shows what I mean:

Z-Axis Digital Readout - A Story in Pictures

See if you can create the narrative just by looking at the pictures!

A Square Hole

I needed this: a square hole in the end of a brass rod.

It's for a project on Beck TD which will be described in another post. The hole needed to be rather precisely 0.120 inches square, and the way you usually accomplish that is with a broach. That's a square tool that is pressed into a round hole to make it square.

Glenn's Wind Blocker

My buddy Glenn has a very nice car - an Audi A5 convertible. He bought it recently as a used, very good condition car. The top-down season is upon us, and he wanted to be able to use the wind blocker accessory that came with the car. Here's a stock photo from eBay showing what that looks like:

Unfortunately, his was broken. The upright portion rests on two rubber posts, and they were both broken off. However, he still had the pieces. He asked if I could fix it, and I said I'd try. It looked like it would be easy to drill through, insert screws, and stitch it back together.

Beck TD, Part 19: Today's Lesson, Learned by Doing

Today I learned that a sloppy M10-1.50 metric nut will also thread on a 3/8-16 UNC (American) bolt! I was trying to marry this turn signal unit:

to a piece of 3/8" diameter polished pipe I had lying around. The light was originally designed for a Harley, and is readily available on the web because it's such a popular modification for those bikes. And cheap! I got a set of two for less than $12 shipped, from Amazon Prime.

Saving Money in the Shop

In a recent post about Beck TD, I noted that some new equipment has arrived at the Grant St. Garage, including a large Index milling machine dating from the mid-50's. Here's another photo, just because I'm really proud of this acquisition. It's plenty big, standing 6' 8" tall - exactly a foot taller than I am. I have to use a ladder to reach the drawbar bolt on the top!

Any time you buy new gear, you quickly realize you need some supporting tools and fixtures.

Making a Round Thing Square

Well, actually, making a round thing rectangular. I had an idea for a way to mount hood straps on the Beck TD, but after making the first piece I decided to go a different direction. But the process of making one was instructive, and I thought someone might stumble upon this post and learn from my fumbling around. Here's the final result:

Beck TD, Part 10: Coupling the Steering

When I installed the steering rack using custom hardware in Part 8, I didn't mention that it wasn't quite done. There's a part called the "pinion shaft flange" that isn't included on the new rack, and in fact, is not available for purchase due to the difficulty of manufacturing it. The flange looks like this - it's the one I removed from the old rack: