Well I wasn't feeling at my best today so I better say that at the outset....BUT.....have you ever tried to do something you have easily done before, only to have one problem after another? Well I have in the past but today's was a woozy!
All I wanted to do is to drill and tap a hole for a 3mm grub screw in a flywheel. I started by squaring up my rotary table in the upright position and secured the flywheel in the chuck. No problems here. So all I had to do is centre the quill (and therefore centre drill/drill) over the flywheel as in the picture below:-
I thought I was being clever by covering the brass outer flywheel cover with insulation tape. I had tried using masking tape but there was a slight marking so over to the black tape. Next I wanted to find the centre of the boss in which I wanted to drill the tapping hole. My edgefinder of choice is the electronic one as seeing the red light coming on when the circuit is made. But yes, you may have guessed but I couldn't see why it wasn't working. I even replaced the batteries.........insulation tape certainly worked!
Okay then over to my other edgefinder which is a laser, but I couldn't get the laser to stay bright enough to register when it was on either edge. By now I was getting cheesed off so I thought sod it I would put the tapping drill in and do it by eye when the drill was fully lowered and alongside the boss. When I thought it was about right I zeroed the digital readouts and was about to drill when I saw the insulation tape!
So off came the tape and I used thick card to protect the flywheel from the jaws. Then the electronic edgefinder was put back and the process started again, only to find that now I couldn't lower the edge finder low enough as it was fouling the chuck!
I then had to get the parallels out to move the flywheel away from the chuck. By now an hour had passed and I stopped for a cup of tea! When I returned the edge's were found, allowing the centre position registered and would you believe it I was only 0.0012" out from the position I found with my eye!!!!!
I was now really cheesed off (I am being really polite). I lost count of the amount of times I tightened and undid the draw bar on the mill.
Oh happy days..........:-?
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!
