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If I've done my sums correctly -

let R be the cavity radius
let r be the pin radius

draw a triangle abc between two adjacent pins, ab, and the center c

bisect ab to make point d.
adc is...

after posting I went back and looked closer - mine's been made by welding a piece of rod in the shaft of a bolt.

I assure you, a couple of nuts and some all-thread, high tensile or no, is def....

> Since I have the attention of some LC-30A users, does anyone know the specs of the original drawbar? And where to get a replacement? Or if another make's drawbar fits? Found my one is a home made...

Hey, thanks for the manual, both to you and to Long Chang! (group)(group)

Vertically? The quill can be fed with the large control on side with a hub and multiple spokes, each with a ball, on right side

The gross height adjustment is to loosen the two bolts that run...

NO, my issue's not accuracy, it's that carpenters think in fractional inches. Can I get solidworks to display 7/16 instead of 0.44 ?

I'm drawing a lumber rack. It's the sort of thing banged together out of lumber. But I've got dimensions all over it like 1.44 inches.

Any way to make that 1-7/16ths?

I'm drawing a lumber rack. It's basically a bunch of lumber and OSB sawed up and screwed together.

Lots of the parts are a sheet of OSB cut out. Side views are sort of pointless, except that the...

I've just 'inherited' one of these. I'm renting space in a shop, and there's one in the shop that was used for a single setup in the old owner's production.

The head handle (handle for the...

Found a cord of maple on the local craigslist for $75. At that price figured it was worth it for firewood.

It's glorious tight grained stuff, and if I can prevent it cracking it'll make beautiful...

In college in the 1980's I had a job as a computer operator for the Kansas Geological Survey, which did maps for many states in the midwest.

They had an amazing ultra high speed plotter - used a...

OK, this thread's a little old, but I had to add my own stories to it.

Band saw - In college I needed to turn something out of aluminum. I didn't have a piece of stock the right size, but thought...

I bought mine from a private hobbyist; He built it from plans he purchased.

CNC machine DIY plans and build instructions

mine looks like the DIYLILCNC on that page.

No, you're misunderstanding - I'm trying to make HO sized clapboard siding - lots of it. I'll cut it up with the laser, add castings and instructions, etc, and sell as kits.
Yes, I know I can buy...

I'm starting to make model railroad and dollhouse kits with my laser, and would like to make my own clapboard and other sidings.

For a model railroad, this means a saw tooth profile about 0.060...

I'd suggest for your first work you get some bits that aren't so tiny - like anything, you'll need some practiced, and it's insanely easy to snap tiny bits.
The 'bravo company' piece looks like it...

I've been doing entirely satisfactory carving in hardwoods with a home made unit I bought (finished) for $500, including the old computer that runs it. After working with it for a while, I realize...

that looks like foam rubber. Hot wire it, don't mill it.

I'm not totally happy with my solution, but from this thread it's the best solution I've come up with.
I've used some 1/2" neodymium magnets I had, placed them in a regular pattern on my honeycomb...

Bizarrely, sometimes not!

I've been climbing the same learning curve learning all the CAM software that everybody else on this forum is climbing.
Sometimes it helps - when I 'lost' my XML file...

Hmm... maybe I can find some small weights, like disk magnets or something, and make a jig to place them automatically? I suppose if I use magnets, I can make an acrylic jig with magnets glued to it....

I'm a professional software engineer who'se gotten old and bored with it, I'm having more fun making stuff that weighs something. I've written CAD and CAM software, I feel like I'm qualified to...

I'm cutting shapes (lots of 1" hexagons) from sheets of corrugated cardboard.

Only problem is, the stock is warped. It's cardboard, obviously a bit of fixturing will make it flat.

Anybody have...

As it turned out my helper brought 4 guys with him, so we just did it by the 'many hands make light work' method.

That sort of 'secret knowledge' attitude probably once had a purpose, when there was fierce competition for every skilled job and keeping shop knowledge secret might save one's family from...

Thansk for the advice. I'll find some equipment tomorrow.

I'm in the happy position of having a 10x42 Logan Lathe on the back of flatbed. The bed's about 40" of the ground. There is a ramp at back of bed, but it doesn't reach the ground.

I have jacks...

Thanks for the openscad pointer. I can probably write a program to make a bunch of dxf files, then read them.

I'm also experimenting with getting a grayscale heightmap, then tracing it in...

I have a couple projects where I have a 3D model and would like to laser cut and manually stack up layers of corrugated cardboard.

One is a terrain model. The other is a lampshade, the light...

Have you considered resin casting? this is a process of casting by pouring urethane resin into a silicone mold.
It's a simple, low capital process, probably a casting will be substantially as...