1st I.C. build "Tiny"

[steamer]

Looking good Bob!     maybe this week....was going to go out in the shop tonight, but my daughter wanted to  watch a movie with me.

Dave

[Flyboy Jim]

That follower looks fantastic Bob. You are moving right along and its nice to see different ways of getting to the same end result.

Bill

You got that right Bill. Both of you guys followers came out great! Being pretty new at all this, I always learn a lot seeing how others machine parts and use that knowledge to come up with the way I'd do it with the skills and tooling I have. For me, I think that is one of the really fun parts of machining. 

Jim

[10KPete]

I agree with comments made by others here. This is great fun watching three of these builds going on. Especially when a Benchmaster is used! 

Pete

[90LX_Notch]

Thanks gentlemen.  The comments are greatly appreciated.

There is a lot of handwork in that follower. The Benchmaster is a tired old machine and I forgot to snug the lock to add some drag on the x axis.  The second side looked like a chipmunk had gnawed on it.  Also, I should have milled the waste away first, rather than machining it as two slots. 

I know how that goes Dave.  Family first.  Saturday I was on a roll in the shop when my wife came to me and suggested that we go out to dinner.  We had such a nice time out.  Well worth it. 

-Bob

[zeeprogrammer]

Family first.  Saturday I was on a roll in the shop when my wife came to me and suggested that we go out to dinner.  We had such a nice time out.  Well worth it. 

 

We can wait.

For a little while.

[90LX_Notch]

I can't in good conscious let Carl wait long.


The Rocker Arm:

I like George's rocker arm much better than the original design so I decided to go with it.

I started with a 3/8 bar of steel and set it up in the Spin Index.  The bar was milled .100x.160 by about an inch long.  George's design calls for a .375 radius.  This was problematic because I don't have a 3/4" endmill.  To overcome this, a 1/2" endmill was placed in the boring head and offset .125.  This setup gave me the necessary .375 radius.  The cut was done as a plunge.  It is important to note that the end of the bar is clamped against a jack with a toe clamp.  This was to keep the bar from flexing or moving.

-Bob

[90LX_Notch]

Rocker Arm continued:

With the first .375 radius cut the part was indexed 180 degrees and the second .375 radius was cut.  Next the .250 radii were cut with a 1/2 endmill respectively.  The part was then indexed and the 0-80 hole was drilled and tapped.

The part was then cut from the parent bar and fixture was made.  The fixture is just a piece of brass that a .062 diameter pip was turned on.  The chuck was unthreaded from the lathe (Atlas 618) and moved to the drillpress where the rocker arm was placed on the pip and used to spot a 0-80 tapped hole.

The chuck was then threaded back onto the lathe and the bosses were faced onto the rocker arm by simply repositioning each hole on the pip.

-Bob

[b.lindsey]

Looks good Bob, still following along here but not much shop time this week.

Bill

[Dave Otto]

Hi Bob

Nice set ups and machining on the rocker arm! Wow that is a fussy little part.



Dave

[90LX_Notch]

Thanks for staying with me Bill.  Looking forward to your next update.

Thanks Dave.  It's a deceptively challenging part.

-Bob

[90LX_Notch]

Rocker Arm continued:

Once the bosses were turned I cleaned up what little material was left on the sides in the mill.  Then the hand work began.  Trust me when I tell you, there is a lot filing and sanding in the finished part.  I'll have to make a more suitable screw for it.  The cheesey hardware store Philips head just doesn't cut it.

-Bob

[steamer]

Sweeeeet!

Dave

[Don1966]

Looking good Bob and we know about small parts and the time involved in making them look like you want them. Your doing a great job of it......

Don

[Tennessee Whiskey]

Beautiful rocker. I've seen several full sized engines with a "slotted head stud" , locking nut, and rounded profile on the other end.

Eric

[90LX_Notch]

Thanks guys, much appreciated.

Eric you described exactly to a "tee" what I have in mind.

-Bob