Grp27: Appendix IV

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Appendix IV ,and Questions answered for Gate 4

Our group is confident that our compressor runs the same as it did before we disassembled it. When we put it back together we had no extra parts, and we had no parts missing. The shaft rotated freely as it did before, and all the pistons are again moving up and down. The casing is back on the gun, and the trigger works once more. The bolts, and screen are put back on the pneumatic system and that whole thing is reconnected to the crankshaft casing with no major gaps or problems.

The same tools were used to reassemble the compressor as used to disassemble. Nothing new was used but one process required a new way of using that tool:

1. Reattaching of the Bearings:

- This assembly required the middle rod that is normally used to screw into the middle of the plate not to be used. Instead the bolts holding the plate and the plate its self was used to press down the bearings back into place. This gave a more even and controlled press of the bearings back in.

The reassembly process was very similar to the disassembly process but there were some variations and differences as well as difficulties. Differences in the assembly process were pretty much straight forward. Instead of pulling apart you were connecting, and instead of loosening you were tightening the bolts and other components. Also some components called for a different way of using a tool:

2. The shaft went in before any of the bearings were pressed back into their respectful channels. This was different from disassembly because during disassembly the bearings came out with the shaft, so logically speaking they should have gone back in with the shaft as well.

3. In disassembly the pistons were even height with each other in relation to one another already. During reassembly, readjusting the heights of the pistons had to be done to move the shaft back in place as well as to get the shaft to like level in the channel so the bearings could be put in, not diagonal like it wanted to go.

We were able to assemble the entire product back together but we did run into some difficulties and problems. Most of these difficulties and problems rooted from the differences in the assembly and disassembly process.

4. The Shaft Would not Budge from lying Uneven:

a. We had to hammer the end a little bit, and just push the bearing in on the left side and hope for the best.

5. Shaft would not fit through connecting rod bearings:

a. Had to keep turning, and turning shaft to slide through the bearings of the piston. This was very frustrating. There is only one recommendation our group would make after reassembling this product. This is to use uniform thread, and thickness of bolts throughout the whole entire crankshaft housing. It was difficult, and also a pain to have to try and find new bolts, and to have to keep switching the bolts every time you wanted to use the press on either the right or left side.

Outline of Difficulties:

1. Assembly of the Pistons: Moderately Difficult: If you have experience working with a socket wrench and remember how the piston goes, then you have no problem.

2. Reinstallation of the Shaft: Difficult: Very hard to turn the shaft to get into bearings. Takes a lot of work and gets frustrating.

3. Reattachment of the Bearing on the Right Side: Difficult: Setting up the bearing and keeping everything in line while you are pressing it back in gets to be a lot. The shaft can get in your way a lot of the times.

4. Reattachment of the Bearing on the Left Side: Difficult: Its thickness is so thin that finding a cylinder to help press it in gets hard, and getting one to work is even harder. Don’t feel discouraged if you have to resort to using a socket and a hammer.

5. Reassembly of the Pneumatic System on back side of compressor: Easy: Put back in washers like in the picture, and then just eight bolts. It’s a snap.

6. Reattachment of the Left Plate: Easy: Just put it on and bolt it in.

7. Reattachment of the Right Plate: Easy: Just put it on and bolt it in.

9. Refilling the Compressor Fluid: Easy: Just fill it up.

8. Reattachment of the Front Plate: Easy: Just put it on and bolt it in.

-Other process had no difficulty levels because they were all easy to do. Everything else was just a matter of screwing back in bolts.