Thread: Farm Boy

Things will only get better for you we all do it. Your machining looks tops. Just think of the money and time you will save while your phone is in the loo.

Originally Posted by Peter White

Things will only get better for you we all do it. Your machining looks tops. Just think of the money and time you will save while your phone is in the loo.

The only thing it has cost is the price of a new phone it is now beyond repair. I am not one for sitting on the phone like the youngsters I use it for emergencies and talking to some of the family occasionally.

Today has been a day of very little done I am just going out to the workshop will see if anything gets any progress. The good news is that some replacement metal has arrived so the con rod can now be made

Started on drilling the cylinder head first was the small hole for a post to take the exhaust rocker. Also drill and ream the two holes for the valve guides

cylinder head (2).jpg

Then onto the four holes for the head bolts also while it was there I did a small dimple which will be where the spark plug will go. The reason the spark plug is not drilled yet is that it needs to be at an angle

cylinder head (3).jpg

top and bottom view of the head the dimple can be clearly seen. There are still more holes to drill some can't be done until the valve guides are made and in place

cylinder head (4).jpgcylinder head (5).jpg

Been working on the valve guides as these need to be inserted in the head before some holes need drilling


Shaped the outside was the first job as well as drill and ream for the valve stems to fit. You can see that the bases are not yet opened up in the second photo.

valve guides (4).jpg valve guides (9).jpg

Changed to a collet chuck so that they can be opened up note the bull nose cutter in the drill chuck to give a rounded bottom to the inside

valve guides (17).jpg

All complete and pushed into the head. They are not going to move now not only can I now drill some holes into the valve guides from the side but they also will aid in getting the at the correct angle as well allow for lining up the fuel chamber where the spark plug pokes through into the cylinder. As well as this it will aid lining up the angled threaded hole for the spark plug which I spotted earlier on in the head(see previous post)

valve guides (28).jpgvalve guides (29).jpg

Slid the valves in just for show, I will fit these properly when I have made some more parts for the head


valve guides (30).jpgvalve guides (32).jpg

Top work as always Derek.

Beautiful workmanship.

Regards

Keith

Thank you Keith.

Except for the spark plug thread which is 1/4" X 32 and I only own a 1/4" X 40 which I seem to have a lot of, so have to order these are ME threads. The head machining is now complete, time to start on some of the furniture for the head like making valve springs and rocker assembly. In the last photo(sorry about the quality) you can make out where the inlet and exhaust ports enter the valve guides. The four holes which can be clearly seen in the bottom of the head photo are for head bolts, the other hole seen in the top of the head is for the rocker arm support and the little hole in the side for a grub screw to lock the support in place.
It seems as if everything turned out OK as closer to completion of the head I was worried that if something went wrong there is a lot of work to get back to here.


Head complete except the plug thread (2).jpgHead complete except the plug thread (10).jpgHead complete except the plug thread (8).jpg

Very well done precision work.

Thank you Peter.

Very little done today just the valve spring keepers, made from stainless steel the measure 0.400" X 0.125" with a 0.125" hole for the valve stem, and also sized a small piece of brass for the rocker arm ready to be drilled and machined.

valve spring cap (1).jpgvalve spring cap (4).jpg

Finally got around to the rocker arm and a small steel bearing which will push on the exhaust valve. As can be seen it is just a fraction over 1 1/2" long.

rocker arm (2).jpgrocker arm (3).jpgrocker arm (5).jpg

Next job the rocker arm support

Great work Derek

I think the fiddly stuff can end up being the most satisfying

Again Top Work

Regards

Keith

So many small and precision made parts; hats off to your patience Derek.

Thank you Keith and Peter. This small stuff is fun.

I started the rocker arm support by turning the upright but still need to shape the top to take the arm but I suddenly realised that I need to use my square collet block to hold it but at the moment there is a pin in it that needs a cross hole. I have already used a centre drill to mark where it need to be drilled and if I take it out lining up the centre point will be a bug bear. The drill bits arrived today but too late to start in the workshop so I will get that hole drilled tomorrow so I can complete that part and proceed with the support.

Hopefully more pictures tomorrow when I have made some progress

Had a delivery of a set of drill bits so I could drill a cross hole in the rocker arm pivot pin, They range from 0.013" to 0.039" so some very small drill bits.

rocker arm support (1).jpg

Then the end of my hammer broke so replaced that head with some brass, I am thinking of doing the other end in ali as the black rubber end is very soft.

rocker arm support (8).jpg

Then onto a little of the engine first job drill the cross hole for a 1/32" split pin as well as make a start on the rocker arm support turned the upright and then milled the top to get ready to drill a hole and slot for the arm to sit in. It will be a different shape at the top once finished

rocker arm support (7).jpg

A picture of the rocker arm with the pin installed. This is not all I have done today as the grass needed cutting and some gardening.


rocker arm support (4).jpg

You do keep busy and great looking precision work.