Made a thin bushing

[digger doug]

American Hollow Boring here in Erie could have probably done it.
Along with several other shops that doo gun drilling.

[toprecycler]

Originally Posted by digger doug

American Hollow Boring here in Erie could have probably done it.
Along with several other shops that doo gun drilling.

In response to the gun drilling, the closest shop that has that capability to us is 250 miles south of us, as far as I know. And we are sometimes getting gun shy with shipping capabilities of getting things shipped and being in one piece unharmed. By the time we factor in the shipping/ delivery, and wait time of one to 4 weeks.

It is just another thing that is nice to know that if needed, we can do this in-house, when the shit hits the fan.


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[toprecycler]

Finally finished the handle for my smaller mill. I have a job I need to do on the mill, so what better time than now to make it better.

My first attempt at the handle shaft failed a couple months ago when I first attempted it. It bent when I was doing the 1/2”-13 thread mount. I’m still getting used to the home lathe.

I managed to get it right tonight. Feels pretty good on the mill too. It has two ball bearings in it so the handle will turn easily.

[milomilo]

Originally Posted by toprecycler

Finally finished the handle for my smaller mill. I have a job I need to do on the mill, so what better time than now to make it better.

My first attempt at the handle shaft failed a couple months ago when I first attempted it. It bent when I was doing the 1/2”-13 thread mount. I’m still getting used to the home lathe.

I managed to get it right tonight. Feels pretty good on the mill too. It has two ball bearings in it so the handle will turn easily.

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Looking good.

[Ironman]

That will make the mill a lot nicer to use

[toprecycler]

Made some bling for the newest lathe in the shop. Of course, the lathe is not my daily use one, maybe someday I will make a nice looking one for my lathe.

Organizer with Chuck key holder.
Made one for lathe I did my apprenticeship one in this shop couple weeks ago.






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[toprecycler]

Pictures of other Chuck key holder.

Also made a bigger set of jaw jaws for mill vice. Was using aluminum ones the other day, and realized they would flex, and part was out of square by .060” in 3 inches. So I needed to make a beefier set. 1” thick by 4- 1/2” tall. Left them 10” wide. I might put some other holes in them for other custom holding as jobs dictate.




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[toprecycler]

Had a job to bore and sleeve the rod end mount and cylinder base end mount for new self alignment bearings on a Cat 777 ride cylinder. I guess these are the shocks for the big haul mining dump trucks. I think CEE has done a couple videos on repair before.

The rod end had parts of the SA bearing broken and impaled into the worn bore. The proper way according to Kurtis to repair these would be by line boring, then welding back up, and remachine to specs. Since our shop does not have a line borer, I do these in the big Cincinnati 2MI vertical mill. This is the biggest bearing mount I have tackled to date. The OD of the bearing is 6.250”.

It was a bear getting the rod mounting bored out. Kept having impregnated hard spots from broken bearings. But managed to get it. Bosses preferred to repair with a sleeve that I custom make on the lathe and press into the rod end bore. I had the retaining grooves cut already too, so once I press the bushing sleeve in, the shop weldor tigged the bushing in.

I could not talk the boss into just letting the welder fill with weld, and then machine the weld to specs. Since he has been doing this for 25 years, and has done all aspects of these jobs personally over the years, it is hard for me to convince him something might be better done differently. So I do it the way he wants.

Then I realized I was going to have a problem with doing the barrel base end. Due to the large 13” diameter barrel, I was going to have problems with height clearance. I figured out that I needed to modify my custom holding plates to accept the bigger diameter barrel, and make a longer mandrel for the boring head. I brought in a 2” dia MT50 taper holder I had so I could make a heavy duty mandrel, since I needed it about 3” longer. Now I get to sell that to the boss. New mandrel worked out great.

Tomorrow I will get to push the bushings in. Then if we ever get the seal kit in, we can get this cylinder back together. We have only been waiting for the bearings to come in since last September.

And the person lift I brought in came in handy getting the barrel onto the mill. The overhead crane does not reach close enough. The barrel weight was over 270 pounds.
















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[digr]

A mighty fine job!!!!!!

[greywynd]

The reason most of us would do them via lineboring is that, once your bearings are setup, it’s a quick switch over to the bore welder that will semi automate welding the bores up.



As to machining them, line bore, milling machine, boring mill, lathe, whatever will turn the tool will work and can be the ‘right’ way to do them.



How much interference did you have between your bores and your sleeve?



This bigger stuff has so much weight being pounded on it that it will wear out the bores, even though they have bearings between the bore and the pins. I hope your sleeves will work, well…they’ll work for a while. I just don’t know if they will get the life that welding would.



Even a lot of the bushings get welded in on the big shovels, often with stainless due to the dissimilar alloys of steel in use. And I’ve seen the bushing fail, as well as the stainless weld, and the bore still need major repairs.