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This is a bit old but I have a question for the experienced casting members. I did a bit of sand casting aluminum about 30 years ago, just a crucible, some firebricks and a propane weed burner torch for the melt, it actually worked out ok, first time! Anyway, I'm looking at trying again and...

There are alternatives, not having used them I can only speculate on the effectiveness but they use an air/mist system at standard shop air pressure up to 150 psi and the say it works. Sterling Gun Drills - deep hole drilling,gundrilling,drills,gundrills,gun drills,toolholders,spraymist...

That's interesting but he doesn't provide even a simple schematic for the 'electrically challenged' like myself. Anyone up for the challenge?

I realize the Trimble method doesn't suggest that, and neither did I though I've read on this forum, people doing it, so obviously it happens, and that wasn't the question. There is no confusion on my part in that regard. I'm not an engineer but it seems to me that because of the pin that is...

This is a bit off track to the original post but ring making related. Has anyone ever done an FEA analysis of the stresses from making a ring with the Trimble method? Maybe I'm out to lunch on this but it seems to me that there would be a high stress area opposite the gap when it's in the...

In my visualization of the way this works it sounds good but is there a rule for the 'desired size'? Obviously a larger starting gap means more spring pressure and you can't start with the final gap distance or you'll have no spring pressure, is the gap you mill comparable to the pin size used...

John Dobson, the guy that made home made sidewalk astronomical telescopes popular made his primary mirrors out of porthole glass. He made the mirrors sitting on a bench and hand grinding them and said there's no such thing as a failed mirror, worst case is you can't fix it so throw it against a...

G28 by definition is to send the machine to home position through an intermediate point. When you use G0; G91 G28 X0 Y0 Z0 the machine would just rapid to home, If you used G0; G91 G28 X0 Y0 Z2. it would move Z2. before going to home. You can also use G28 in absolute mode. In my programs, on a...

It works but is a lot slower and you do need to use a sacrificial piece of glass under the part you are cutting, typically it's adhered with rosin, at least in the amateur astronomy crowd. The abrasive is generally just loose 60 grit SiC.

If you do a search for 'carbide insert designation chart' there are quite a few examples, the problem arises though when you get to chipbreaker designations as each company seems to have their own descriptor. There are positive rake inserts for steel and just to add confusion to it all, you can...

You can do it but I have an old TurboCAD V16.2 that I use for that sort of thing, it has way better sketching tools or maybe I'm just more used to the TurboCAD since I've had it for 20 years. One of the nice things about having the TurboCAD is that I found the switch to Alibre very easy as the...

From a personal perspective, Fusion360, Solidworks and others like them are more powerful, what I like it that Alibre is far more affordable and it's pretty intuitive to learn. It doesn't do surfaces but can modify them and it doesn't have all the special modules that the pricy ones do but it...

McMaster-Carr doesn't sell to individuals in Canada, with few exceptions, you have to be an educational institute of some sort or a business.

Call Terra Nova Steel & Iron, 3595 Hawkestone Rd, Mississauga, ON L5C 2V1, (905) 273-3872, they are distributors for Durabar

Here is a formula I got off a blade forum, can't remember which or I'd give the poster credit. 5oz boric acid (roach powder) 3oz borax ( 20 mule team is fine) 8oz denatured alcohol ( the cheap paint store variety, not the drug store stuff) 2oz satanite ( our old refractory friend) 3-4oz ocher...

It appears that the carburetor throttle has a square to locate the arm, why not rotate the arm 90° and place your Casey Jones style throttle lever 90° to the engine cylinder, I suspect the vibration of the running engine is parallel to the cylinder which is why the level moves in the first place.

There are cars built like that!

The friend is just starting to make wheels for the drag racers and to that end has built a track in his shop for testing, I've got to get over and see that.

That kind of racing is still big in Europe, a friend of mine builds some of the most winning armatures for the top end slot cars and showed me some of the races on Youtube, the cars are just a blur on the track. I think the cars he builds armatures for are 1/32 scale, the races are an...

My compressor is an old 40-50 year old Champion R15B on a 60 gallon tank with an automatic drain that didn't work. The comparable replacement was expensive and had the same issues as the old one in that it had a pickup that comes in through the side of the vertical tank and hopefully drains the...