2020 POTD Thread Archive

[addertooth]

In preparation of changing out the headstock ball bearings in the LMS 7350 (7 by 16 lathe), with Wider tapered bearings, a more narrow keyed spacer needed to be made. One is 0.1 inch more narrow than the original plastic part, the other is slightly more (some people suggested that 0.1 inch shorter was not quite enough to get perfect gear alignment with the gear on the spindle with the feed gears). The facing, OD and ID cuts were a piece of cake. Using the mini-lathe as a "shaper" to cut the keyway was a bit more arduous. The steel is cold rolled and quite hard. Each pass of the shaping tool was only removing 1.5 thousandths of an inch in the keyway cut. It just made sense to fabricate the parts in advance.

 

[FOMOGO]

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

 

[GoceKU]

Wow, that looks very familiar to me, what surprises me how good the edge of the rim looks, i usually destroy them by the time i stop.

 

[FOMOGO]

Yes, I was amazed it survived too. Was able to reuse it. Mike

Wow, that looks very familiar to me, what surprises me how good the edge of the rim looks, i usually destroy them by the time i stop.

 

[NC Rick]

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

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!

 

[FOMOGO]

Ford Explorer. Most likely a stone cut, or something similar. Fairly rough road in places. Mike

 

[pontiac428]

FOMOGO, you were supposed to warranty out the Firestone tires on your Explorer years ago!

 

[dewbane]

Had to use a cutoff wheel to get the two remnants off.

You don't realize how strong beads actually are until you need to cut through one. I feel your pain.

 

[dewbane]

I finally made a 29-tooth gear that worked. I turned the last failure into a 24-tooth gear.


I think my gear skills are good enough to start making some real parts now. I also made a little gear demonstrator thingie with three pins on it. While I was fine tuning the spacing, I dropped it, and shop gremlins ate it. Seriously, I just don't understand where it went. I was too tired to start making another one, and so I decided to call it a day.

 

[keeena]

Here's my first CNC-based project on my Alliant BP clone w/ a ProtoTRAK Plus 2-axis controller (pic in this thread)



The part is a bracket for a motorcycle footpeg (also called rearsets). The other one is aftermarket for racing and broke due to a crash. The manufacturer doesn't make this style anymore and my buddy was in a pinch to get one w/o having to buy a full L&R set with new pegs/levers/etc... It gave me the motivation to finally give the CNC a shot. Process was a little tedious - using freeware CAD, no CAM, no post processor, no PC->PT+ interface (I'm debugging that)...so the whole process had some quirks. And had to get a little creative with work holding given what I have. But more than pleased with the result. And that's there is the first attempt - managed not to scrap material or tooling!