Thread: Farm Boy

Great craftmanship going on here will look great when finished.

Originally Posted by Peter White

Great craftmanship going on here will look great when finished.

Thank you Peter I am getting there slowly soon I will be onto some of the smaller pieces of the build as well as cutting two gears which should be fun

Brilliant work Derek

You are a Master Craftsman.

Regards

Keith

Thank you Keith.

Been busy with the last part of the con rod and that is a bronze big end split bearing. The small dots are there to make sure that when it is taken apart to assemble the complete model they stay in the correct orientation

con rod with bearings (1).jpg



Then it is onto the crankshaft assembly, the plans show it mad from a single piece of steel but I have decided to make it up from two small pieces and some silver steel.
First was to make the two webs made easy by the use of a small home made stop which worked a treat.

crankshaft 1 (7).jpg


Turning the raised sections as well as the curve on both ends I had to do this set up 4 times two for each piece

crankshaft 1 (20).jpg



After the part being deburred I am pleased with the result

crankshaft 1 (26).jpg



All the parts for the crank shaft assembly

crankshaft 1 (46).jpg



A dry fit to check everything was in line. I have left the main shaft in one piece until it is finally fitted together then machine the middle away afterwards. I will locktite them in and also drill for a tapered pin in each of the joins. The two pieces at the top of the photo are just machined to the correct width for the gap in the middle.

crankshaft 1 (1).jpg


Still more to do to this once it is finally fitted together

What with gardening and cooking yesterday, I always cook a special meal on a Saturday for the wife to give her a day off. Nothing got done on the engine.

Today started a lot better so I took my time as there is a lot of work to restart the crankshaft if I mess up.
Drilled and pined the second conrod bearing and cleaned that up and as can be seen the pins disappeared

Crank shaft 2 (6).jpgCrank shaft 2 (7).jpg


The main shaft was loctited in at the correct spacings before drilling and taper reaming for the tappered pins as I did with the first shaft once again cleaned up and no sign that they have been pinned. I don't want it coming apart


Crank shaft 2 (13).jpgCrank shaft 2 (14).jpgCrank shaft 2 (15).jpgCrank shaft 2 (20).jpg


The job I was not looking forward to is machining two 1/8" keyways the longest one is 1/2" long This was done using a 3/32" slotting cutter so was very slow as too much pressure on that would snap it like a twig. This meant that I had to machine down the centre and then widen it with a cut down each side


Crank shaft 2 (22).jpg


Final job was to cut and machine away the main shaft that passed between the two crank webs. At least that is the crankshaft completed


Crank shaft 2 (29).jpg

Hi Dalboy,

I have been following this thread I am impressed by your skill with metal and tools. I googled "Farm Boy" it wasn't a term I was familiar with, is it a brand name for small farming machinery?
It seems to be a range of what I grew up calling rotary hoes, the market gardeners around home used them.
Can you post a picture of what you are making?
Thanks. Rick

Originally Posted by Rick47

Hi Dalboy,

I have been following this thread I am impressed by your skill with metal and tools. I googled "Farm Boy" it wasn't a term I was familiar with, is it a brand name for small farming machinery?
It seems to be a range of what I grew up calling rotary hoes, the market gardeners around home used them.
Can you post a picture of what you are making?
Thanks. Rick

Farm Boy is the name of a model engine designed by Jerry Howell it is what is known as a hit and miss stationary engine. Stationary engines were at one time very popular on farms and places like that to run various machines something like the modern petrol generators.
This will eventually be a fully running model when complete

Take a look at this ONE which someone has built

Very impressed Derek

Thanks for the link. It's going to be a beautiful engine.

Regards

Keith

Originally Posted by Rick47

Hi Dalboy,

I have been following this thread I am impressed by your skill with metal and tools.
Thanks. Rick

Sorry Rick I did not thank you for the kind comment. The Rob Roy loco and this are the first time I have worked with metal to this extent normally I work in wood.

Originally Posted by Keith_1

Very impressed Derek

Thanks for the link. It's going to be a beautiful engine.

Regards

Keith

Thank you Keith. Yes hopefully I will do it justice mine will be painted

What with making the crankshaft the next part was drilling and reaming for the main bearing, as well as making the bearings which was not so bad.

Anyway this job was done without any problems but I did spend a little time setting up to do this task.

All done and fitted just a little clean up now to get rid of some marks. I do need to ream the bearings again as the caps pinch it very slightly rather this than too loose.

crankshaft fitted (8).jpgcrankshaft fitted (6).jpg

A simple job completed and that is to prepare the blanks for gear cutting, I need to do a little reading on the dividing head to cut the teeth.

One of them is steel and the other bronze they also need to be spot on for the diameter as well as the centre hole size.

gear blanks (2).jpg

I'm sure you will get them spot on as you do with everything else.

Originally Posted by Peter White

I'm sure you will get them spot on as you do with everything else.

Not everytime some parts I have had to make two or three times. It is a case of getting the set up right which I have learnt the hard way on a couple of times. This is all new to me and I have learnt a lot so far and still loads more to learn

I have been getting the gear cutting set up ready for the two gears.

I made an arbor for the gear cutters a while back these cutters normally come in a set of about 7 depending on the number of teeth required for this build I only needed two one for 72 tooth and the second for 36 teeth each cutter has a range of the number of teeth required.

DSCF2861.JPG

Next up was to make a pair of clamps to hold the dividing attachment to the milling machine as the clamps I already had are two thick

rotary table clamps.jpg

The final set up ready to cut the first gear, you can see the blank in position ready for the first cut of 72 teeth. This involved turning the handle 1 full turn and 5 holes on the 20 hole ring on the plate for every cut.



gear cutting set up (2).jpg

The final gear cut just the small one to do which means changing the cutter and resetting the hole guides on the plate will try that tomorrow


gear cut (3).jpg

Now I have a pair will have to see how they work together once I have the bits all made for them to rotate on as there is a cam to be made and also the shaft for the large one. I think the one on the right looks the better of the two




Gears complete (1).jpg