2021 POTD Thread Archive

[hman]

That's really a fantastic design for a boring bar holder (adapter)!

 

[BROCKWOOD]

I need to make 3 more myself. Looking real good!

 

[devils4ever]

I made a Stomachion or Ostomachion Puzzle. It is attributed to Archimedes and is considered one of the oldest puzzles known. Supposedly, there are 536 unique ways to solve this with 17,152 total combinations considering rotations, reflections, etc.

I initially was going to make it from 1/8" Aluminum, but decided last minute to switch to Baltic Birch plywood because it has a better feel and look.

I used FreeCAD to draw all the pieces and generate the G-code to mill them out using tabs to allow going around the entire piece. It was the first time using tabs and it worked great.

 

[mattthemuppet2]

thanks all, I'm happy they're done They're all filled with tools already, with some tools left over, so I'll probably make a few more at some point for swapping tools in and out as necessary.

thanks hman, I stole the design from a tool holder bushing I saw on Amazon. I think they're used in turret tool holders on CNC lathes. I also didn't have a 14mm reamer, so this seemed easier

 

[GoceKU]

Today i got the day off work but also a late start. First on the list is the blue 206 that needs a rust repair and protection. The passenger sill panel got replaced few months ago but drivers side only had small amounts of rust. I left it then because of my freshly reinjured back and knowing it will be 10x easier to do it in the inspection pit. Now the time has come, i cut back as much from the rust that i could and did not have much left, so i started with welding in a new inner panel directly to the main support that has lots of stiffness and let mu weld and then hummer around a new peice for the floor. I used some thicker steel 1,5 mm i had left from the little niva project. Then i focused on the main square support, for it i welded in a square tubing, thick wall and managed to solve it in deeply. Then i made 2 more plates and welded all the holes, and used some seam sealer to seal the welds and all the small pieces that i could not weld. Then i used couple wire brushes on a drill and angle grinder to knock down all the loose rust. There was a lot of rust and dirt, so i got me a wet shute can of oven degreaser, spray the floor pan down, shut off the power for the inspection pit and pressure wash the entire floor and engine inside the garage. I'll have to see how it look tomorrow, but i'm sure it will be much cleaner because there was lots of dirt falling off. I plan to chemically treat the rust and undercoat only the threatened spots, this car will be a workhorse not a show car.

 

[GreatOldOne]

Not a lot - I made a holder for my new Facom Allen / hex wrenches & my old Wiha torx keys. It’s just a lump of aluminium I found out my scrap box that had been used for something else, and already had some holes drilled in it - I repurposed it. I cleaned up the outer diameter, resurfaced the top and added to the hole pattern to make use of the old holes in a sensible way.

 

[rabler]

Finished up my fixture plate yesterday. 12"x12"x1" 6061, 3/8" holes tapped on 1" grid. Ordered a clamp/hold down kit based on 3/8" studs. 7 holes drilled for clearance to recess 3/8" socket head cap screws to allow an unobstructed surface in terms of holding the fixture plate down. One in the center, and 6 in a rectangular pattern to span multiple T-slots on the two different mills. I'll need to make several T-nuts of various sizes tapped to 3/8-16 to work with my two mills, and two different rotary tables.

I suppose I could make a pass on both sides with a fly cutter or face mill, for now it's just been deburred and stoned lightly.

 

[brino]

finished up the latest batch of toolholders, I'm sure I'll be making more in the future though..

Where do we place our orders?


-brino

btw: the colouring looks fantastic! Have you documented your process here?

 

[mattthemuppet2]

ha, not for a while, I'm pretty tired of making toolholders I'm not even sure how many users of FIMS toolposts there are out there, they're not very common any more.

I used ammonium nitrate hot bluing. It's pretty simple, just add some AN to water, bring to the boil and add steel, leave boiling for 30min or so. The key is in getting the steel super clean. I boiled them in water and Dawn first, but that wasn't clean enough. Had to scrub them down with engine degreaser too, then the black oxide formed nicely.

 

[Doug Gray]

This week I had a nice paying gig to do some Victaulic grooves in 2" pipe stubs.

Here is the specs on these grooves.










I made a video of the process here