Author Topic: Project: ArgoCeptor!  (Read 11129 times)

Offline garretttpe

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Re: Project: ArgoCeptor!
« Reply #138 on: January 03, 2019, 05:26:19 PM »
Cool
I went to school on the T56 then transferred to the T76(Garrett 331) during last phase of school, I also ran the test cell for the T700 (CT7) and now work on both the Garrett 331 and CT7, the Garrett is on the CASA 212 and CT7 is on the Bell 214...8 years and hopefully I will be retired......

Offline SARgo1

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Re: Project: ArgoCeptor!
« Reply #137 on: January 03, 2019, 04:22:12 PM »
Looks Awesome, What Jet engine did you work on, I have been a Garrett 331 overhaul mech since 1987,

J85CAN40, T58GE-100, T56, GE CT7-8E.

J85's I used to place the front frame on the stand and build an engine on it. The others, not quite so deep. Usually no deeper than down to the combustion chambers. Compressors was never a shop I got in to other than the J85. No time to get that involved.

Retired from all that now....couple more months and totally retired.

:)
« Last Edit: January 03, 2019, 04:28:52 PM by SARgo1 »

Offline garretttpe

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Re: Project: ArgoCeptor!
« Reply #136 on: January 03, 2019, 04:11:17 PM »
Looks Awesome, What Jet engine did you work on, I have been a Garrett 331 overhaul mech since 1987,

Offline SARgo1

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Re: Project: ArgoCeptor!
« Reply #135 on: January 03, 2019, 04:07:56 PM »
Cooled off and assembled:







On the transmission input shaft:



Gotta say, I'm pretty pleased with my work!

:)

I don't even want to think about how much it would have cost me to have a machinist build this chunk....... :o
« Last Edit: January 03, 2019, 04:12:26 PM by SARgo1 »

Offline SARgo1

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Re: Project: ArgoCeptor!
« Reply #134 on: January 03, 2019, 02:44:26 PM »
Been a bit of work, but the input adapter is ready for the hub:



I knurled the hub shoulder in order to give it a little more "bite".

Then the hub goes into the oven to soak at 500f for 20 mins:



I wrap all my heated parts in tin foil for the heat soak. Occupational habit. When I'm building jet engines and fitting something like a #2 engine bearing, we always wrap it in foil to try and keep it as hot as possible on the trip from the oven to the compressor stand.

First, one last check of the input adapter to make sure it's microscopic clean (IE: nothing to hang or cock the hub when it goes on) and then the race from the oven to drop the hub down on the adapter:



Nice. Slams right home on the shoulder of the adapter. you can't even get a .001 feeler gauge under it:



I'd normally do what we call "drop measurements" to make sure it's fully home, but it's more than good enough as it is for this application. No light under the adapter works for me!

Now to wait an hour or so to let it all cool. The steel hub sucked up the heat right away and it's all too hot to touch now. Last hurdle is for the aluminum casting to NOT crack once cooled, meaning my interference fit is good to go.

Then it's make a simple spacer for the input shaft (to keep the sprocket properly positioned on the hub and help locate the adapter on the shaft) and it's done.

Then on to making the offset sprocket adapter for the VF750 transmission output shaft. Compared to the rest of the machining to this point, that's easy peasy!

After that, i can get on building the exhaust. That's will be "a treat", but no where near as exacting as all the machining work so far, so it will go together relatively fast. 

:)

Offline SARgo1

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Re: Project: ArgoCeptor!
« Reply #133 on: January 01, 2019, 09:53:11 AM »
Well, the fist keyway went all wonky on me at some point and I had to abandon it. Seems the cutting tooth shifted (or I misaligned it at some point) and it cut a ahoulder too wide.

So I flipped 180 out and cut a second keyway. That one went fine. Right now, Im finishing up with a little file work to get the fit juuuust right and then its back to mounting the drive hub on the adapter.

Once thats done, i have to cut a simple spacer to postion it all correctly and then its on to making the offset sprocket for the VF output shaft.

Bit of a long fight, but Im getting there.....
« Last Edit: January 01, 2019, 09:04:17 PM by SARgo1 »

Offline SARgo1

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Re: Project: ArgoCeptor!
« Reply #132 on: December 29, 2018, 10:20:18 AM »
Well, it's cutting:







But maaaaannnn.....is it ever slooooowwwwwwww. And it hooks and hangs a lot as well. The "dents" you see on the end of the turning are there because every time it would grab it would rack the turning, so I'd reseat it with a little bumping from the hammer. I eventually dismounted it, turned the jaws of the 4 jaw around and used the curved sections to hold the turning. That seemed to solve the racking problem. Probably should make myself a brass hammer too.....

I had to go though a couple grinding sessions until I got the cutting tooth just right. Very fussy to get the geometry just right so it would it cut the 1018 well.

I had to rework the "nose" of the bar a couple times to get as must depth as I could out of the blind hole. I also had to drill a hole in from the side to give the chips a place to break off. That was a fun task. One drill bit broke off and I had to abandon it in the hole, a second hole I messed up my measurement and it was too far up the bore, the third was in just the right spot. I'm not too worried about the couple extra holes, they're under the press fit hub once it's all assembled and the turning is so thick, a couple 3/16 holes are to going to hurt anything except my OCD.

I had several problems with the tool turning in it's mount, which caused most of the grabbing problems. I finally figured out it was actually the tool post turning in the compound rest. With the amount of force on the tool post, there was just no way to keep it from "creeping" as i worked the slotter. So I mounted up the Atlas milling attachment and that solved the problem. Side bonus is it also allows me to set the height precisely.

But I think it's going to take me 6 weeks to cut the keyway! LOL! Probably would go much better if I was cutting aluminum instead of 1018.....

Offline SARgo1

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Re: Project: ArgoCeptor!
« Reply #131 on: December 26, 2018, 07:55:02 PM »
Certainly not finished, but here's the "mostly completed" keyway cutter I'm building:



It's got a 4.5" stroke at the cutter position and has a .003" runout at the full length of the stroke. Pretty good for my first attempt at making a "shaper". I'm thinking of adding a gib screw a the front and back to take up even more of that .003". But it's certainly usable for my purposes as it sits.

Next is to mount the cutting tool at the end, make some spacers to replace the washer stacks you can see in teh linkages and some misc finishing up work. Eventually, I'll turn a handle for the end of the lever bar.Just to clean it up if nothing else.

:)

Offline SARgo1

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Re: Project: ArgoCeptor!
« Reply #130 on: December 25, 2018, 03:43:15 PM »
After a totally frustrating and wasted day, I chucked the steel I had for the broach out the door.

Seems the block I was going to use had a broken off drill bit in it. After trying to punch, drill and other wise remove it from the face of this earth, I gave up and fired it in the trash pile. Being xmas eve, it was that piece of steel or nothing. I figured that was it until Well after xmas day as most places around here where I can get a block of steel 1 or bigger are pretty much closed up until january.

Got up this morning and in one last attempt a saving the project, I found an old 1 1/4 receiver hitch tongue in the back of the garage.  I chopped it up and it machines like a dream. Some kind of mild steel, carbide tools glide right through it and leave a nice finish.

So after half a day of dinking in the garage, I have the cross slide 5/8 holder and the 5/8 cold rolled bar built.

Now to move on to making the rest of the broach/shaper attachment...,after the turkey dinner settles and I can move again that is!

;)

Offline garretttpe

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Re: Project: ArgoCeptor!
« Reply #129 on: December 24, 2018, 03:21:20 AM »
All I can say is OUT FREAKING STANDING.....

Offline ascaw

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Re: Project: ArgoCeptor!
« Reply #128 on: December 23, 2018, 08:55:50 PM »
Looking forward to seeing it done and in action.  It will be interesting to get your thoughts on it compared to how it was.

Offline SARgo1

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Re: Project: ArgoCeptor!
« Reply #127 on: December 23, 2018, 07:32:10 PM »
Test fit complete! Hub goes on the adapter slick as snot!


I took a few thou off the adapter since last posting.


I used the same technique I use to drop #2 engine bearings on compressors (one of the things I do/did at work is build jet engines from the compressor disc up).


I placed the adapter on a nice thick, flat slab of granite (I have a couple pieces that I use for surface plates when building racks of carbs and such) for a couple hours to get it temp stable with the room. Then I wrapped the hub in tin foil and in to the oven it goes (500c) for 20 mins.


I pulled it out of the oven, move quickly out to the garage, unwrap the hub and slide it down on the adapter. Goes right down to the shoulder with no problems. Well, a little drag, but that's more about me keeping it square than it not fitting.


Since I need to still cut the keyway, I pulled it back up off the adapter before it had a chance to contract.


I didn't want the hub locked to the adapter in case I mess up the keyway. I had planned to put it together and then cut the keyway, but common sense won out and said to fit the hub after cutting the keyway.  It would suck to mess up the keyway and have to throw out the adapter but I'd have a major meltdown if the hub was locked on to the adapter and I flubbed the Keyway. If I broke the hub trying to get it off, I'd need another CBR600RR wheel to turn the hub out of! No thank you, I'll wait to make sure the keyway is right first!


I worked it down to a measured 0.003" interference fit with maybe a +/- 0.001" error because of the measuring tools I have to use here. The way the hub slid on and off, it could very possibly be more like 0.002" or 0.001". Definitely won't go on when cold, so it's an interference fit for sure. If it is closer to 0.001, the back up plate and bolts I plan to add later will help lock it together to help deal with the drive torque it will see.


So, tomorrow; build myself the broach and if time, cut the keyway. After that is done, drop the hub on the adapter and on to making the offset sprocket for the engine output shaft.


Coming along nicely. Can't wait to take it for a proper rip across the field!


:)

Offline SARgo1

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Re: Project: ArgoCeptor!
« Reply #126 on: December 23, 2018, 02:06:07 PM »
Actually, come to think of it, it might make more sense to just use a socket cap head screw and instead of going from the inside out, come from the back of the steel plate into the aluminum body.


That would give me a full head to grab when installing and removing the components. For that matter, I guess I could use a standard head bolt if I wanted since I would no longer have to worry about the bolt interfering with the internal cush drive dampers....
« Last Edit: December 23, 2018, 02:08:03 PM by SARgo1 »

Offline SARgo1

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Re: Project: ArgoCeptor!
« Reply #125 on: December 23, 2018, 01:26:19 PM »
I think I'm going to make change to the drive adapter construction. The mechanic in me really is rubbed the wrong way with shrink fitting the hub to the adapter and there being no way to remove it without, essentially, destroying it. After all the time put in to building it, I sure would be "peeved" if something broke and there were no reasonable way to salvage the remaining good pieces.


So I think I'm going to change from a shrink fit to a press fit. This will mean less "holding power", but I'm going to fix that with another change. I'm going to machine a 3/8" plate to fit on the large diameter of the adapter and then grub screws through the aluminum hub to the 3/8" plate. The press fit will keep it running true and hold torque inputs, the grub screws will aid in keeping the hub from rotating and help handle the torque. Where the screws will be going is the ticker part of the piece, approx 0.250". It also open the option to use 5 to ten screws if I want (there's 5 compartments in the cush drive). One row in close to the hub, one row further out by the edges. It would pretty much have to blow apart for that to fail under load...


I also decided to machine a groove in the large diameter. This will give me a place to attach a puller if/when I need to get the entire assemble off the transmission input shaft at sometime in the future. An example of needing to get it off in the future might be changing the driven sprocket to change the final drive ratio:





The adapter is a slip fit on the shaft, but a little corrosion and we all know how easy it is for these type of things to "rust weld" themselves together over time. the ability to use the puller makes it feasible to actually get it back apart in that case! LOL!
« Last Edit: December 23, 2018, 01:50:02 PM by SARgo1 »

Offline SARgo1

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Re: Project: ArgoCeptor!
« Reply #124 on: December 22, 2018, 08:52:49 PM »
Getting there. Slowly but surely;



Still to do; finish the bore to final size for the transmission input shaft, machine a groove on the large diameter (so I have a place to grab with a puller when I need to remove it), machine a recess in the large diameter for the transmission input shaft retaining bolt and broach a keyway in the trans input shaft bore.

Then its just shrink for the CBR600RR wheel hub to the center diameter and its good to go. Couple more days of just lazy paced work should have it done.

Then its make the offset sprocket for the engine, cut the chain to fit and move on to building the exhaust.

Little work to wire it all up and then its ready for a test run. Maybe in a week or twos time.

:)