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Cheers :D Well the posti dropped off the material for the fly wheel. :ddb: So first job was to cut off a 1" slice from the tube its 100 od with a 4mm wall. Then face to length 3/4" Skim up the OD Then clock up the OD in independent four jaw chuck because the tube is relatively thin and it...

Thanks for looking in bazz Still waiting on some material to finish this engine off, in the mean time visited our local hobby craft shop and they were having a bit of a clearance and picked this stuff up to have a try at staining the wood chip Its water based wood stain and some felt tip...

Thanks Ernie/Jim I'm waiting on some steel tube to make the fly wheel so decided to get on and finish the bed plate off, I carfully marked the position for the crank bearing and drill them out 2.7mm clearance on M2.5. The bit of ally I made the bed plate from was 3" wide I wanted 2" but that...

My offering this morning are just a few of the fiddly bits that need doing. Drill and tapped the eccentric for a M3 grub screw As I drew the engine up I relised that there was no provision for setting the valve event, I scratched my head on this one for some time then I had a look through the...

Phew:- Thanks for your replies Guys for a moment I was beginging to think every one had been abducted by little green men Stew

Hi Ernie Yes if you put the reamer through in the tail stop it cut over size as thing don't quite line up, putting it through on the carrier pusing it with the running centre in the tail stop, lets it float and find its own centre hence it cut perfectly to size. Hope this helps Stew

IS THER ANY ONE OUT THERE The Boss was has been away all day visiting an old school friend, so I was in pigs heaven, all day in the shop. First bit the crank shaft, turn up and thread the end and cut off Next bits the crank webs, made from 1/2"*1/4" mild steel bar cut off a couple of bits...

Thanks for the support Lads :thumbup: I ordered a chunk of 1/4"* 3" ally plate from ebay, for the bed plate I first carfully marked out the position for the cylinder assembly i had to drill and tap 2 more m3 hole into the cylinder base to fix it I intended to screw to go right through the bed...

A few more parts done, First up the bearing brasses:- drill the clamping holes in some 1/4" brass square bar Then bolt them too the con rod mark the centre line and drill and ream through 6mm dia Then make the end plat sorry no pics for that bit. Then make the little end gudgion pin The the...

Bit more done:- the Cross head Made from a bit of oblong section bar, start by marking the centre on a end face accuratly centre pop the position. The using a wobble bar centre it up using a four jaw independant chuck. Turn a step up centre drill and tap M4 for the piston rod. Keeping it on...

Onwards and Upwards with the bearings housings. These are made from 5/16 thick bar not 1/4 as in the drawing i thought 1/4 would look a little flimsy. Fist job measure the height of the piston rod to make the bearing centre height the same, then cut a couple of chuncks of the bar roughly square...

This mornings job was to make the con rod. Cut a length off 1/4*5/8 mild steel bar allowing a little extra on the length. Mark it out then drill the hole for the bearing, to get it flat place the bar on the table put the vice over the top and clamp up on the bar, that it nice and level with the...

Yes it is the way of the design world Brian you can always see opertunity for improvement or just a good old tinker.:D I mark up the drawing in pencil and revise the drawing when I've finished before writing it up. Thanks for your interest Stew

Her you go:- But I have found a few erros and I've changed a few sizes, increased piston rod to 4mm dia for one, as I've gone along, I'll also be changing the valve rod attachement to the eccentric arm so that you can adjust the valve timing so you'll have to watch out for that one. Stew

The boss has been working today standing in for a sick teacher, so had the day all to myself in the shed, almost done an 8 hrs shift so when i've done this i'm going to have a nap. Made the stuffing box for the valve rod Drilling out the top hat bit Spot drilling through into the valve body...

Cheers Guys On with the cylinder, I had a bit of 31.5 mm diameter ally in my stash a little undersize, but if I didn't clean up the OD I recon it will do the job, so faced a chuck off to lenth, then drilled and bored it out 16mm ID The using the four jaw with the cylinder longwise face off one...

Yes we call them odd legs, I've know a few weomen like that :big: A couple more bits finished off this morning up bright and early before six and a good 3 1/2 hrs in the shed, while it was quete (heaven :headbang:) Whilst i'd got the four jaw in tha lathe I quicly made the square base bit...

Hi Gordon Pleased you got it sorted Stew

Ok Chips The use of the cut back legs, :- say you want to scribe a line 5mm from the edge, you set it on 5mm lock it up, then with the long bit up against the edge you scribe the line with the short bit. The foot is so you can use it as a depth guage I have a thread someware in the dark past...

I have an old works friend who's just getting started in Model Engineering along with his 11 year old son who's his showing a great interest in engines with a developing tallent for 3D CAD. Chatting to them got me thinking about an engine that could be built in a relative short time with limited...