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: The biggest time-wasters in your workshop?|
The best small toolpost I have ever seen is the very simple post and block type which was used on the 3-1/2 inch Drummond lathe; this is very easy to make and is ideal to use with 5/16 square toolbits. I made two of these for friends and they have been delighted with the speed and ease of setting them.No packing required. Colin
|Thread: Barley Twist|
I would twist square bar using vice and large adjustable spanner. Colin
|Thread: Toleranced and open dimensions on drawings|
When I was an apprentice all of the drawings had a grid reference system. Any changes were entered into the box provided for the purpose on the drawing template giving date of change, grid reference, new dimension and previous dimension. This seems to be a sensible way of noting any changes. Colin
When I design my models I work to a simple system: Mating parts are either Slide fit (SF), Drive fit (DF) or Run fit (RF). A slide fit is just that; it slides with no perceptible slackwhen lubricated; drive fit is lubricated to avoid tearing and forced together at 0.001 to 0.002 per inch diameter interference (which requires a good surface finish) and run fit requires a clearance to allow for lubrication and expansion where applicable. I write other tolerances as I think necessary and always dimension from one datum corner to avoid accumulated errors. colin
|Thread: MT3 Imperial and MT3 Metric differences|
It is the drawbar thread that's different. You can have one of each drawbar if you accumulate a mixture of fittings. Colin
|Thread: Arbor Presses.|
If you intend to use the press for punch & die sets a flypress is a must to locate the upper and lower tools accurately and to obtain enough force. Arbour presses are only suitable for light imprecise work although a Desouter type dieset would give the accuracy element but probably cost too much. Colin
|Thread: Condensation in workshops|
Greenhouse bubblewrap insulation under the plastic roof of my workshop has made a vast difference. Colin
|Thread: Black hole|
Having lost many small parts at the parting -off stage over the years and having to part off some tiny ball ended handles that were particularly difficult to make , I cleaned all around my lathe, surrounded it with card board walls and used a small cardboard box to catch the first one. I can't possibly lose this one! The little handle went into the box, jumped out again, landed on the flat belt, and must have joined the satellites because it didn't seem to land anywhere. The gremlins find a way whenever they wish!! Colin
|Thread: Acceptable Quality|
I bought several ER25 collets from ArcEuro as they were the lowest cost and I've been very satisfied with quality and accuracy. Colin
|Thread: pillar drill advice|
For a general purpose metalworking drilling machine you need the lowest bottom speed and the heaviest machine as the lower speed is better for the larger drillbits and the weight is able to dampen vibration more effectively. Colin
|Thread: Laser Cut Flywheels|
Perhaps annealing/stress relieving would reduce/eliminate the vibration problem? Colin
|Thread: FWIW 4 in angle grinder|
I've wondered about using such a saw but though it was too dangerous without a sole for the saw to pull against. Seems that it could grab. Am I missing something? Colin
|Thread: tool tip height|
Might seem a silly question ,but does your lathe spindle lift due to slack when machining? A lever under the chuck would show up bearing wear.I don't know this lathe but spindle end float could also be a cause of poor performance. Colin
It seems to me that the tool may not be clamped rigidly, perhaps not flat underneath or too much overhang. Colin
Edited By colin hawes on 05/11/2012 16:16:44
|Thread: Scale down 7 1/4" drgs to 5" Gauge|
Wilf,you should be aware that the cross section of scaled down rods is is subject to a reduction in strength to only about 0.475 of the original design for your scale change and this may mean increasing their scaled sizes or using higher spec. materials in some stressed components. Colin
|Thread: Cast iron|
I don't know the application for your cast iron project, but sometimes the obvious is easy to miss.When I design things I take standard stock sizes into account so as to involve minimum waste and machining.Dooes it really have to be exactly 130 mm finished? Colin
|Thread: Drilling sliding scales|
I think you ought to forget drilling scales when clamping is perfectly adequate. Colin
|Thread: Feeling of inadequacy|
Some modelmakers are perfectionists and there is nothing wrong with that ,they do superb work which I admire, but I and many others are happy just to make things that work.Don't expect to match ,in the short term,some of the work you have seen at exhibitions but just go at a comfortable pace and skills will creep up on you. Happy modelmaking. Colin
|Thread: Self adulation|
Having used machinery dated from c1890 to todays date including CNC and treadle lathes I feel no envy for anyone who has all the most expensive modern equipment but get great pleasure in using my old machinesand see no advantage in buying new, often noisier, machines.It's the end result that counts.It's supposed to be a hobby not a production shop!
|Thread: Lathe Spindle/Chuck Concentricity|
My 84 year old 7 " drummond lathe has a free thread fit and a good register and is very repeatable for concentricity. I believe that the register is the only important area but the thread must be perfectly square to its axis to seat the chuck to the back face of the register. Colin
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