A Wallaby of my own.

[Dan Rowe]

I checked it my gear gage set

Dave,
One of my issues with bevel gears is how to inspect them... I checked my Starrett and a few other precision tool books and I am not finding a gear gage set could you post a photo?

Thanks Dan

[steamer]

Here's some pictures from our workshop session....staring my son!
Indexing....


Feeding....


Checking the part...even though its scrap....


Here's the "gear gage" I spoke about.  It's marked Boston Gear.   
It has a wide range of diametral pitch and 14 1/2 - 20 degree pressure angle on two sides.


And a sketch of the cutter.

On edit....the .154 dimension below should be from the front of the end mill to the end of the cutter...not to the center of the endmill!


And my Starrett gear verniers....that can't quite reach down to 32 DP


Dave

[Dan Rowe]

Dave,
Nice set of photos.
I was thinking about a gage like a thread gage but until I saw the photo is did not dawn on me that it is a rack. I can machine a rack

Dan

[steamer]

You could make it like a circular rack....much like Arnolds gear hobs...without the relief cuts.......

Dave

[steamer]

I wonder how many 4th graders know how a gear is cut on a mill or what 32 Diametral pitch stands for....let alone doing it for themselves......On an Aciera F1! with a Starrett gear vernier....and a dividing head!

He's got it soft!!! .....and I love it!

Dave

[tel]

You could make it like a circular rack....much like Arnolds gear hobs...without the relief cuts.......

Dave

Yep, and then mill 'arf of it away a'la 'D' bit fashion.

Give your young bloke an ONYA from me Dave!

[Maryak]

I wonder how many 4th graders know how a gear is cut on a mill or what 32 Diametral pitch stands for....let alone doing it for themselves......On an Aciera F1! with a Starrett gear vernier....and a dividing head!

He's got it soft!!! .....and I love it!

Dave

Wonderful to see your son in action 

Your spoiling him with those fancy measuring tools 

Still, I wish I'd been spoiled like that..........my Dad's teaching methods were more of a  shall we say direct nature. Spare the rod and spoil the child approach. Gotta say though...........it worked. 

Best Regards
Bob

[swilliams]

Looks like you've got him hooked Dave. He's just the right height for operating that mill 

Steve

[steamer]

Ordered some bronze for the new gears.....ouch....It'll be here by the weekend....

Dave

[steamer]

Working on the drive bushing for the OIL pump..   I need to put in the 1/8" square drive hole.    I'm considering various methods....suggestions anyone?

Broach
two piece insert
Change to a Tab/slot
File it out by hand

Dave

[zeeprogrammer]

Have some one else do it?
I guess that's a pretty lousy suggestion. 

[steamer]

NO WAY!

Article suggests a file.....

I think I'm thinking about it too much!.....just do it!

Dave

[Maryak]

Dave,

I had 3 of those to make on my H&M, 1 in steel, 2 in brass. I drilled them - 1/8" then broached with 1/8" square HSS after rounding off and tapering the leading edge.

Interestingly, after messing about, I found my bench vise was more than adequate and gave me the best control over the broach.

Best Regards
Bob

[Don1966]

Dave it is great to see you son trying to follow you footsteps. I am still working on my grandsons, but the video games are winning.
Now that I am here I get to see you finish the wallaby. I will be following alone.

Don

[steamer]

OK...brainfart

I forgot that I have a toolpost mounted keyway cutter.   I forgot that you can make a half round cutter and cut 1 side of the square side hole at a time while indexing the spindle.    OK so I had a blank tool that I turned to .109 OD and then with the filing rest cut it to dead center of .0545.       I then set the keyway cutter up on my toolpost and brought the tool to the center of the part held in the collet chuck,  Got it concentric to the .109 bore and pushed it in,  Then moving the cross slide out slowly while reciprocating the tool by hand, I cut .055 out from the center.    Then returned to zero and turned the part 90 degrees and repeated the cut.

Once I cut all 4 sides ,,,,it slide right on with no slop!   Easy peasy!

I have pictures.....but Im more interested in a cold IPA at the moment!

I'll post some pictures tomorrow.

Dave