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Member postings for colin hawes

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?
28/01/2013 14:50:21

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
27/01/2013 17:39:16

I would twist square bar using vice and large adjustable spanner. Colin

Thread: Toleranced and open dimensions on drawings
27/01/2013 15:30:44

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

26/01/2013 17:53:50

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
23/01/2013 17:19:53

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.
11/01/2013 21:08:27

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
09/01/2013 14:04:31

Greenhouse bubblewrap insulation under the plastic roof of my workshop has made a vast difference. Colin

Thread: Black hole
04/01/2013 13:30:27

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
01/01/2013 15:33:49

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
30/11/2012 15:44:14

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
22/11/2012 16:51:03

Perhaps annealing/stress relieving would reduce/eliminate the vibration problem? Colin

Thread: FWIW 4 in angle grinder
15/11/2012 15:53:31

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
06/11/2012 11:43:02

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

05/11/2012 16:12:50

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
03/11/2012 12:27:43

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
03/11/2012 12:09:26

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
03/11/2012 11:54:00

I think you ought to forget drilling scales when clamping is perfectly adequate. Colin

Thread: Feeling of inadequacy
03/11/2012 11:50:00

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
18/10/2012 09:50:36

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
17/10/2012 18:03:51

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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