Here is a list of all the postings colin hawes has made in our forums. Click on a thread name to jump to the thread.
|Thread: Engine plans|
When I was working as a toolmaker fractional dimensions were only used for an unimportant dimension such as the base of a drill jig and had a tolerance of +/- 1/64 th of an inch. Apart from standard threads, everything else was dimensioned decimally anyway, normally in "thous", e.g. 1.002, often in "tenths", e,g, 1.0002, so it was very similar to metric dimensioning apart from the basic unit of one inch as opposed to one millimetre.
Having many imperial tools and old but excellent imperial machines I naturally welcome imperial drawing dimensions but I have had to work professionaly with both systems so I really am not bothered by mixing them when making things. A lot of what I do now is restoring parts of vintage motorbikes which are generally measured in inches anyway. I do have a metric micrometer, digital calliper and a DRO so conversion is easy anyway. Incidentally , what's imperial weight got to do with machining things? Colin
|Thread: Magneto windings|
Neil, thank you for your references, they are what I was really looking for and it has shown me that it would take too much of my model making time to attempt a rewind with uncertain results so I shall now consider whether to get a rewind done or convert to electronic ignition in the interests of reliability. Colin
Thank you for your advice ,Clogs and Martin, I guessed it might be a bit of a problem so I am more likely to avoid this one; reluctantly as I have always been one to have a go at anything. Colin
Has anybody tried to rewind a lucas motorcycle magneto and what is the wire spec, gauge, number of turns and length of wire used for primary and secondary windings? I am thinking about attempting this and any information would be of interest. Colin
|Thread: Blue chips|
There is a difference between machining at production rates with a jet of coolant and machining on hobby machines with a low or non existent coolant flow. It is my opinion that many amateurs go for published production rates at the expense of tool and machine life expectancy and machining mild steel with HSS on a hobby machine should not be producing blue chips. Colin
Edited By colin hawes on 29/07/2018 15:41:56
Your 12 mm cutter should be nearer 500 - 600 RPM for general machining of non free-cutting mild steel. Colin
|Thread: drilling files|
A Stellite drill made from a round Stellite rod with a three sided pyramid shaped point will drill though a hardened file or a HSS cutter. It has to be run at high speed with quite a lot of pressure on a machine and it gets red hot. Stellite cannot be softened by the heat and it can be easily sharpened on an offhand grinder. This is a method which I have used many times in the past when a hole is needed through a hardened component. Colin
I spent a week, off and on, looking for the red handled chain spanner which I've had for more than 20 years to remove the car's oil filter. The one day I walked into my shed and saw it straightaway; it has a blue handle! Colin
|Thread: Workshop Build - Floor height|
My wooden workshop is at least 12 years old and has a concrete floor with gravel under it and a damp proof plastic membrane between. There is a small, shallow, ditch around it that drains away any water to a lower level. I have an old carpet on the floor and it is always dry. The concrete is about 3" thick and supports my heavy machines adequately. Colin
|Thread: Repairing a Verdict Dial Test Indicator|
Can you buy replacement probes for these older Verdict lever indicators? I've got one with the ball broken off. Colin
|Thread: DO GEAR TEETH ROLL?|
It seems to me that things are further complicated by the number of teeth engaged at any moment and if a rolling contact on one of them takes the strain off a sliding one.Colin
|Thread: Case hardening powder, any advise?|
My understanding is that the second heat is to refine the grain structure of the component. The part would be allowed to cool after the carburising and then hardened in the usual way .Colin
|Thread: Obtaining flat bronze bar|
Another way of doing it? What about simple press tools , a vice and thinner metal? Colin
|Thread: Pickling acid|
So apparently we will now need a licence to possess and use sulphuric acid brought about by the tendency of some of todays youth chucking it at people. I use it for quick cleaning copper quite often although I know there are other less satisfactory ways of preparing and cleaning copper. Colin
|Thread: Silver Clay , Copper Clay and Bronze Clay|
At what temperature does the clay have to be sintered; It sounds interesting. Colin
|Thread: Ajax AJ8 horizontal Mill - cracked casting|
I would use an internal 5mm steel plate, tapped to accept C/S screws, bedded on resin and pinned with dowels. The screws can then be filled and painted. Colin
|Thread: Arbor Press Question|
A flypress would definitely suit your application better but you need to determine the right size. Colin
|Thread: Dead Sherline motor?|
Looks like a burnt out winding to me , means a replacement armature if everything else is ok but a replacement motor would be best. Colin
|Thread: Thechnical issue regarding plaster.|
Old houses used a lot of sand mixed, I think, with lime to make the plaster and then covered with a smoother plaster. Perhaps it is the high sand content that eliminates the cracking. Colin
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