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Thread: Farm Boy
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28th July 2023, 07:58 AM #61
I did the piston above a few days ago and decided to make the con rod in the mean time while waiting for the o ring.
After two attempts at this I threw the parts in the scrape pile and ordered some replacement ali. Yes two made and both buggered up by me making stupid mistakes.
In the interim I took a day off and decided to make a small vice stop for the mills vice.
Vice stop (6).jpgVice stop (3).jpg
Any way after the day off of the Farmboy I returned today and turned the blank for the head at least that went right after double checking and double checking again was not going to have another con rod episode.
head blank (3).jpg
If the con rod was a failure and leaving me a little down hearted, today I then managed to drop my phone down the loo .
Things can only get better at least the head went to plan so far.
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28th July 2023 07:58 AM # ADSGoogle Adsense Advertisement
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28th July 2023, 08:06 AM #62Senior Member
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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.
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29th July 2023, 01:50 AM #63
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
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29th July 2023, 06:45 AM #64
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
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31st July 2023, 07:43 AM #65
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
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31st July 2023, 11:34 AM #66GOLD MEMBER
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Top work as always Derek.
Beautiful workmanship.
Regards
Keith
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2nd August 2023, 03:33 AM #67
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
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2nd August 2023, 06:09 AM #68Senior Member
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Very well done precision work.
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3rd August 2023, 02:54 AM #69
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
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7th August 2023, 03:27 AM #70
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
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7th August 2023, 10:30 AM #71GOLD MEMBER
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Great work Derek
I think the fiddly stuff can end up being the most satisfying
Again Top Work
Regards
Keith
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9th August 2023, 03:02 PM #72
So many small and precision made parts; hats off to your patience Derek.
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10th August 2023, 06:25 AM #73
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
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11th August 2023, 07:02 AM #74
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
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11th August 2023, 07:55 AM #75Senior Member
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You do keep busy and great looking precision work.
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