Well the last couple of mornings have seen most of the work now completed. The brackets have been completed - except the important polishing and finish. I made the 8 stainless steel inserts and in hindsight I should have made a fixture so they could all be turned to size easily. My long winded way of dealing with each one separately however did work, just took a little longer.
Today (14th) I drilled out the brackets. This involved quite a bit of work as listed below:-
1 Use square on vice against the two stainless steel inserts to set square.
2 Use edge finder to find the centre of the stainless steel inserts both length and width.
3. Drill with centre drill.
4. Clamp stainless steel inserts in place so they won't move on drilling.
5. Replace with 3mm pilot drill through both stainless steel inserts.
6. Replace with 5mm drill and drill through both stainless steel inserts.
7. Replace with 6mm drill and only drill through first insert (clearance size)
8. Remove both insert and use 10mm end mill to mill through to first inserts top.
9. Replace with 6mm drill and drill trough to base on lowest insert.
10. Replace with slitting saw and cut slit through to centre bore.
11. Tap the lowest stainless steel insert 6mm
12. Clean up 7/16" insert bores and drilled inserts
13. Remove bracket and reverse to do the same to the other clamping side.
14. Remove and assemble all inserts and bolts.
15. Go to 1 and do the second bracket...............................
So you can see there is a lot of work in just cross drilling and slit sawing the brackets! however that is all behind me now and the only remaining machining is to bring both uprights to size. This can't be done until the bike is here really to see what room there is to play with. So the next task is to clean up all the work, removing any machining marks and then polishing it up (plus the red paint at 1" intervals on the uprights) which will take a good couple of sessions.
However as long as I feel well enough to go into the workshop I believe that they will be complete for this coming weekend and then I can get back to this years main project (last touched in February!!!) the pair of 4 cylinder petrol engines to a design by Edgar T Westbury.
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Using a square to set the position of the bracket for both drilling and slit sawing the slot
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The stainless steel inserts – one for tapping the other for clearance
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Clamping the inserts so they don’t move when drilling
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One bracket finished -except for finishing! Lot of work on polishing to come
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The full ‘monty’ as it were – both the uprights with handle bars and the brackets themselves – phew!
About Mike Freeman
Hello, my name is Mike Freeman and I am a retired Chief Fire Officer from the United Kingdom with a keen interest in model engineering, silver caddy spoons and sea fishing. I live in the pretty fishing port of Brixham, South Devon, in the United Kingdom.
I am a sufferer of degenerative osteoarthritis, which impacts on the amount of time I can spend in the workshop, and is the reason why you will see seats and a stool in some of the photo's. I have only recently added the above sentence after a discussion with one of my Doctor's from the excellent pain clinic, based in Torbay. This does affect concentration one of the reasons why I double then re-double my measurements and set ups.
Before completing nearly 30 years of public service I and my wife Sandy, owned and ran, a small restaurant in Okehampton Devon. Prior to marriage I worked for my father in his various businesses, in the early days these were garages, which he bought in a run down state, then built them up before moving on, to start again.
I took every opportunity in those early days, to work in his workshop's
learning 'on the job' rather than as an apprentice. This, I suspect, is the reason why my building various model's in the early days, turned into model engineering, when funds allowed the required equipment to be bought.
My workshop comprises one half of a detached double garage. It has a
stud wall separating the two halves and unusually perhaps, its own
shower/toilet/washbasin compartment! (the true reason for buying the
bungalow - don't tell the wife!!!)
It is fully insulated with a ceiling and fluorescent lighting supplementing the one window. Several double electrical sockets are dotted around in
relevant positions.
Equipment consists of 2 lathes (1 Myford ML 10 and 1 Chinese variable
speed motor with etched glass DRO's), 1 milling machine (RF25 far East) floor standing pillar drill, Proxxon bandsaw, Warco bandsaw, 6" wire brush and polishing mop motor, 6" coarse and fine grinder, Proxxon mini drill, various benches and an engineers vice. I have just acquired a third lathe, a Myford ML7 which I am at present evaluating so I can decide which of the Myford's I will keep.
I have only just bought the Chinese lathe and had it fitted with DRO's prior to delivery. And what a bonus they are! So good in fact that I decided to buy another set for the Milling machine. Whilst my engineering experience can only be described as limited, I find the use of DRO's has affected my accuracy levels which have improved tremendously (although that's not saying much!) and would recommend their fitting to any model engineer.
Prior to retirement I built for my son's 17th birthday a Locost car. This
was a tremendous project and a great feeling when it passed its test. The book it was based on suggests it can be built for £250. Ours was nothing special in the sense of all new parts but still cost about £900 to build!
