Saw table progress report: Too little time……but well get there..

Well I have managed to get back into the workshop albeit for a short time. So far I have adapted the motor and cut a keyway into its shaft. I had to make a spacer from cast iron and sat a leaded bronze washer between the gear wheel and tha cast iron spacer. The next job carried out was to mill down both edges of the joint between the two parts that make up the main backplate holding the gears and saw arm itself.
First pulley for the gear and its bearing

First pulley for the gear and its bearing

Once the parts were milled to fit each other a series of 4mm countersunk screws were tapped in one plate with claerance holes and countersink heads. The back plate was milled 10 thou short on one edge as I am going to try and weld the aluminum together. Spacing out the 4mm screws at 0.5" though seems to have made it very firm but nevertheless it will be a usefull exercise. I also may have a weld with a few screw holes if the back works out ok, similar to spot welding on car panels.

Tapping the joining part between plates with 4mm countersunk screws

Tapping the joining part between plates with 4mm countersunk screws

The next task was to turn the gear pulley shaft for the drive off the electric motor. To enabe me to use different gears and therefore speeds I decided to add a slot for the gear shaft to move into. Beacuse the backplate is soft aluminium and I want durability I decided to make a brass insert in the shape of a 'T' with a slot for the bolt part of the gear shaft to sit in. The size was determined by marking out the centres of various gear combinations. Once the slot was fitted it was pleasing to see that it worked as expected. makes a nice change.........

Brass slot insert for the gear holding shaft

Brass slot insert for the gear holding shaft

Now seeing how well the slot method works I am reconsidering the use of a tensioner pulley. If setting up another slot fot the third pulley it may just be a case of making the adjustments for each set up and fixing them in place.

So the present position is I have the drive from the electric motor via gears to the fisrt pulley completed. The saw arm has been cut to shape and the length of the backplate finalised. The next jobs will be to produce the other pulleys and brass slots and cut the gearing onto the saw arm and the yet to be made quadrant. That will be followed by milling slots in the floor and saw table top to allow the uprights somewhere to sit. They will be secured by tapping and countersunk screws. The numbers will depend on how well the welding goes.

Progress to date with backplate to length

Progress to date with backplate to length

More to follow when I am fit enough to continue.

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!
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