2020 POTD Thread Archive

[Ianagos]

So I finally have some lathe work I can actually show off. Typically I can’t show any parts I make. I am very happy with how these came out.

Material is 17-4 stainless h900 at 47hrc (I checked with my Rockwell tester to make sure. So it not quite hard turning but it also is not soft.

All diameters on the part came out to within .0002”.

It was very tricky to turn such a long skinny part so I did it in steps and if you look closely the lines can be seen.

The part is just for a forum member of a different forum i am a member of. The part probably costs less than $10 normally but he couldn’t find any in stock.

I forgot to take picture on the machine but for my first operation it came straight out of 3/4 bar stock sticking way out of the chuck 2.5”

Then I grabbed an er20 collet chuck and flipped the part to finish the stem because there was a feature I couldn’t reach from the 1st side.

Here is the second set up.

 

[francist]

Built a garden shed today. Well, a garden closet really (there’s such a thing, right?)

I had this pile of lumber from some built in shelves I took down couple weeks ago...



....sooo, I turned it into this. Just a place to lean a few shovels and keep the empty nursery pots out of the rain. Think I’m going to have to lean it over and knock four inches off the sides though, bugs me that the roof sticks over top of the fence.



Thanks for looking.

-frank

 

[Superburban]

Yikes! I have never seen a tire failure as catastrophic as that. Truck or car? Low pressure? I'd like to avoid such things for sure!

Mine at least came off the bead. This was at 75MPH on I 70 the other day, while towing a trailer. Mine was due to old tires, I do not normally take this truck on anything more then the city roads. But had no other choice My normal tow vehicle is down for a water pump. Did not think about the tires being old with small cracks. Lost a good trim ring & hub cap.

 

[hman]

Geez! Glad you survived it. That first photo kinda looks like a haircut from back in the '60s

 

[Superburban]

I got a nice chunk of tread out of it. Not the best pic, but this is the ring of tread (First pic) it was the in between parts that gave out. Tires do not have many miles on them, just showing their age.

 

[NC Rick]

Mine at least came off the bead. This was at 75MPH on I 70 the other day, while towing a trailer. Mine was due to old tires, I do not normally take this truck on anything more then the city roads. But had no other choice My normal tow vehicle is down for a water pump. Did not think about the tires being old with small cracks. Lost a good trim ring & hub cap.

I have had such issues with trailer tires where I didn't know it went or just had to go a bit further (multi axle trailer). That happening on the tow vehicle could be potentially dangerous. I'm happy it worked out.

 

[Superburban]

I have had 3 blow outs (1 front, 2 rear, I have had a 70's or 80's Dodge ever since 1980) with these 70's and 80's Dodge trucks, and lost a rear tire & rim on an 89 Suburban, with no problem in keeping them under control. Maybe it is because I drove tractor trailer part timesince the 80's, and then 20 years full time. But I do not think it is. I don't think so. I think their simpler design is why they do not have the loss of control issues that many later vehicles have.

 

[Ianagos]

I made the smaller version of the same part as yesterday today and this one gave me a little more trouble. First pet came out with half a tho all around but that was not good enough so I made another and it’s within tenths again. Plus it’s a cnc so I’ll I really did was change a few offsets and run it again.

This is the second setup after its cut.

These are the test parts after the first operation. You can see where the were parted off and I use a groove turn tool to get the shank most of the way to size so I only need a finish cut on op 2

For all the nay sayers out there that say you can’t get good finishes and turn small diameter with negative rake inserted carbide her is my finishing tool.. this is not how I cut the part it was sticking out much further for that. This is just for reference.

And lastly here are some pictures of how I inspected the height

It was hard to get a real accurate measure but the tolerance is pretty open. The larger one was much easier to measure.

Indicator ball was too big in that last setup I actually ended up using this indicator

I also changed the stack to exact height of the part.

I was pretty happy with the accuracy there only about .012mm off or around .0005”

 

[mattthemuppet2]

rebuilt 4 Jacobs chucks


finally organised my wrenches so I don't have to go rooting around in a drawer to find them


built a battery for my mower out of old cells from my bike battery. No protection on the battery as I had to bypass the protection to get it to work, but I'll make sure I'm the only one using it so it doesn't get abused



also fixed another mower battery that had 1 duff bank of cells. Bit of a fiddle fart to get the old cells out and 2 new(ish) cells (old bike battery cells again!) back in, but amazingly it worked just fine in the mower. Was real surprised about that.


not my prettiest repair, but my tab welder wouldn't have managed material that thick so soldering was a better solution.

 

[Skierdude]

Had a minor tire issue to deal with. This is what a blowout on a washboard gravel road at 60 mph looks like. Had to use a cutoff wheel to get the two remnants off. Mike

View attachment 338462

I had a tire on my trailer explode doing 50mph. Wheel rim ended up looking just like yours FOMGO. After I fitted the spare I went to the tire repair shop, carried in the rim and asked if they could fix my flat tire. Gave them a laugh.