Chief Delphi - pushing a gear on a fp

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Re: pushing a gear on a fp

We needed to do this for the first time this year. After reading this thread, I used the arbor press the way Cory recommended and had no problems. Our press is very small, half ton, from northern tool. The FP and gear barely fit. With the ram all the way up like it was, slop was not an issue. This small press however required a pretty hard pull on the lever.

Re: pushing a gear on a fp

Quote:

Originally Posted by mwibbels (Post 763513)

While it is a bit hard on the manual mill's quill and chuck - the method I like to get everything lined up and the gear in place:
1. make sure the bore of the gear is properly sized
2. mount a sacrificial Al block in the vice
3. mount the drill chuck in the spindle with a small center drill with a tip smaller than the 3.2 mm shaft
4. peck a divot in the Al block - less deep than the length of the shaft extension out the back of the motor
(then without moving the table of the mill)
5. remove the drill bit and open up the chuck until the outside edge of the chuck is ~ the same size as the outside of the gear
6. set the backend of the FP shaft in the Al block's divot and the gear loosely on the other end of the output shaft
7. press the quill down until it contacts the gear and holds it in place - then use your fingers to align the gear with the chuck teeth
8. press a bit more and the gear should slide onto the shaft without buckling the shaft

For small motors, big mills, and robust chucks - I don't worry too much about the stresses - for smaller equipment I would proceed with caution - could take the load off of the chuck by constructing at stepped shaft that will seat on the bottom of the chuck to align and press with.

Yeah, pressing is very easy if done right. You could even do it with a small hammer or rubber mallet if you supported the shaft right. I recommend the small hammer. We used a #30 drill bit to bore out the gear. It was slightly loose (it slid on the smooth part but the splines made it a good fit). Use loctite.

-Vivek

Re: pushing a gear on a fp

Hi All,

This is a little late, but I don't think it was suggested yet. Since 2001 we have been pressing pinion gears onto our little drill motors, fp motors, mabuchi motors etc.. with the 6" milling vise on our mill.

Here's the basic idea. place the motor so that the squeezing action of the vise forces the pinion onto the motor shaft. You will want to place some parallels (laying down) or scrap metal in the bottom of the vise to prop up the body of the motor. By doing this, you can raise the motor in the vise so that the motor terminals will straddle one corner of the vise jaws. This way you will not have to worry about crushing the motor terminals and can even put the pinion on with wires soldered to the motor. We usually straddle the motor terminals on the front or moveable jaw section and place the pinion gear at the rear jaw. The next step is to get something square to make sure the body of the motor is square to the jaws from side to side prior to pressing the pinion. Since the bottom of the vise with the parallels in them is already square so you don't have to worry about that.

Using a wrench to close the jaws allows for a precise way to press the pinion gear on to the motor shaft. to push the pinion below the end of the motor shaft, we usually put a spacer with a hole in it between the rear jaw and the pinion gear for the motor shaft to press through the gear. Sometimes we put a piece of scrap between the motor and jaws to protect the vise.

I think this is harder for me to try and describe than show. If you need a picture of this, let me know.