Economy Hit & Miss Engine

[Nick_G]

Looks to be decent castings Nick as I can't see any sign of blow holes or other flaws

There were none Jason.  .................... So far.

In general I am impressed. Good quality iron that have obviously had great care taken when aligning the moulds.

Nick

[Graham G]

Hi there Nick G, Taking shape nicely, I will be watching this one evolve from casting to bang bang      Graham G

[zeeprogrammer]

The 2 ugly sisters both machined.

Not so ugly anymore. 

[b.lindsey]

They look great to me Nick. Nicely done, one big job behind you now!!

Bill

[Nick_G]

.
Cheers guys. 

In hindsight the machining may not be finished on them. The more I look at other hit and miss engines and the photo of 'the real one' posted into this thread I see that very often the sides of the flywheel have a recess cut into them which is then painted leaving a much smaller area of bare metal on the sides. 

Nick

[Jasonb]

If you are going to have a pully then you can paint all the rim as this was the usual way rather than blinging them up.

The extra bit of mass does help on a model engine so maybe give it a test run with the thick rims and then if you want reduce them down.

[Walsheng]

I don't know what size engine the model was scaled from but my 1.5HP has 18-1/4" flywheels and the rims are 2" wide.  How wide are your rims?
One of my many pipe dreams was to model in 1/2 or 1/3rd scale the engine I have but was kind of wondering is if the flywheels are scaled down that much will there be enough mass left.  So I think Jason's comments are right you should probably leave as much mass as you can and try it first.
Let me know if you would like any high resolution pictures.

John

[steamer]

Here it is...as promised.

My 8 HP Simplicity.     42" flywheels with a 16" pulley

6" bore x about 10" stroke.....and yes it runs quite well

Dave



http://vid164.photobucket.com/albums/u27/mcandrew1894/Family/Simplicity_zpsce76e166.mp4

[steamer]

By the way, the 16" pulley,  on the other side from the video, is mounted to the spokes of the flywheel, not the shaft.

There are bosses on the surface of the spokes for the mounting.

The rims of flywheels are hollow and are 1/3 full of fine sand.   This "Auto balances" the engine as the sand distributes itself opposite the side of imbalance.

Cincinnati Milacron precision grinders had a auto wheel balancer with 3 steel balls that floated in oil in a circular race that did the same thing...very clever.

This engine is somewhat rare...I've only seen perhaps 3 or 4 of this size Simplicity.

Dave

[Jo]

That's a nice big one 

Not sure how I would move it around 

Jo

[steamer]

It's mounted on a trailer....The engine is mounted on large Oak skids, just like the original ones they were copied from.

2600 pounds.

My dad used this engine in the 30's to cut cord wood and fill silos with a blower.

Dave

[Jo]

My dad used this engine in the 30's to cut cord wood and fill silos with a blower.

So it is a family heirloom as well as being highly desirable 

Jo

[steamer]

It's a bit much....stuff this size owns you....not the other way around...

Dave

[Nick_G]

How wide are your rims?


John

Hi John,

The flywheels are 10 1/2" dia x 1 3/8" width.

Regards,  Nick

[Nick_G]

.
Decided to square up the base casting. So cleaned it up a bit and mounted it onto the mill with a fly cutter.



No nasty blow holes and the CI machined nicely again easily.



I thought I would as I said have to get 'creative' when mounting some of the castings in the mill. Doing the underside is the first one. I drilled 2 holes so that I could mount it securely, these will also be used when it comes time to bore the holes to take the main bearings. - I would have line bored them in the lathe but I don't have enough centre height from the top of the lathe saddle. One of the holes will be under the mounting plate of the cylinder / hopper casting so will not be visible and the other I will plug and fill after final machining and before painting. ......... Well that's the plan anyway.!



The paper under the bearing end is to create a 0.8mm shim. This was needed as the block under the other end is an imperial 2" one and the diff between that surface and the bearing beds is 50mm (bloody continentals and their damn metric system) 



Nick