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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: Hostaform, Nylon or Steel For Mini Mill Gear?
29/05/2019 14:26:49

I have always reckoned that gears should be unbreakable not fail safe and that plastic of any sort for this job is used because it is far cheaper to injection mould a plastic gear than to machine a steel one. A sheer pin device would be used if protection was considered necessary but I have known a Tufnol gear to be used in a gear train to reduce noise. If my minimill gears ever strip I shall replace them with steel/cast iron ones and grease them well. Colin.

Thread: Variable Speed Drive belts - acceptable dimension tolerance
21/05/2019 18:14:32
Posted by Adam Harris on 20/05/2019 19:34:44:

Colin would the deformation process result in the outer top edge becoming hard and cracked/crusty or do you think it would deform remaining pliable ? The belt I am replacing has its outer top edge worn into a state where it is hard and cracked and I believe this is making the big noise from the variable pulley system. I'm not sure in the world of variable speed pulleys how significant a 1 degree difference is in profile of the sheave vs belt

Edited By Adam Harris on 20/05/2019 19:35:14

When I say deform I mean continually bend to wedge in its groove not wear; after all, the belt has to continually deform to go round the pullies. I have never seen the Hardinge drive but I guess it consists of interlocking pulley sides which must be hard on a belt anyway especially if the sector edges wear to be sharper. I don't claim to be any sort of expert on drive belts but just giving my thoughts as requested. Colin

20/05/2019 18:19:38

I would expect the belt to deform that one degree to seat in it's pullies after a running in period.

Thread: stamford show vandals
20/05/2019 12:56:45

This sort of destruction is completely beyond my understanding and I like to think I can understand most things. We see the same sort of destructive attitude to flower displays and newly planted trees in parks when real humans think they are lovely and would like more. Wanton destruction should attract a long and very visible hard labour sentence of benefit to the community.

My sympathy goes out to the club.

Thread: Cutting steel to size
12/05/2019 19:18:43

I use a Warco bandsaw for soft metals and mild steel and an angle grinder with 1mm cut-off grinding wheel for tougher steels (to save the saw blade) Colin

Thread: LED replacement bulbs
30/03/2019 17:17:32

I bought LED 14W bulbs from ASDA. They give a light output like the 100W filament bulb. Colin

Thread: Skyhooks - an overhead solution
30/01/2019 11:20:36

A hinged and latched notice board fixed to the ceiling could be a space saving way of hanging a drawing for those of us whose neck objects to looking up too long. Colin

Thread: Cutting Speed Table
12/01/2019 12:25:16

The cutting speeds can be wildly different to the theoretical but generally the speed can be set by what the tool temperature and the machine can withstand; the feed rate can be increased with speed up to that limitation, for example, we often use far to slow a speed to cut screw threads because we can't handle the feed rate. The same applies to facing large discs where we need to consider the largest diameter although the speed is really too slow at the smallest diameter when you have no facility to continuously change the speed. By "feel" you can increase the feed rate as the surface speed increases. Colin

Thread: Commercial boilers
05/01/2019 16:18:40

Commercial miniature boilers have to be CE marked or they can't be tested by clubs. They have to have a test certificate to be used in a public accessible place.

Thread: Practice facing
04/01/2019 14:41:33

Keep HSS tools very sharp and with plenty of clearance rake at all cutting edges. I find that industrial recommended rake is too little for the sort of work we usually do. Colin

Thread: Planned Obsolescence
04/01/2019 14:32:06

My HP printer will happily print my Word documents but when I try to print from the internet it now comes up with " unexpected configuration problem 0x80004005 ". I have little knowledge of these things and wonder if this has been caused by a windows update or some other cause? Colin

Thread: Small part holding
01/01/2019 10:59:52

Double sided sticky tape. Colin

Thread: Easy way to centre rectangular shape in 4-jaw
21/12/2018 10:06:59

Place in 4 jaw with packing plates to cover the open sides. Set one face of the job to vertical. Wind in the cross slide to touch the job preferably with a DTI, but can be done with the tool tip, and set dial to zero then rotate chuck through 180 degrees and touch the job again. Note the difference and adjust the chuck jaws to move half of the difference. Repeat for other sides. Colin

Thread: Modern efficiency !!!!!!!!!
19/12/2018 10:02:33

It seems that an EV may be said to reduce on-the -road emissions and running costs but I am wondering what the true cost is for things like battery lifetime and the replacement of batteries. I haven't seen much printed about that.Colin

Thread: Year of Engineering
17/12/2018 12:38:57

Duncan, I agree with your assessments, I was about to write the same points myself. Colin

Thread: What material is it
16/12/2018 09:56:47

Aluminium bronze, horrible stuff to drill. Colin

Thread: 2.05mm or #45?
16/12/2018 09:53:36

Normally a 2.1 drill would be used for M2.5 thread as there is likely to be slight deformation of most materials as well as the cutting action and that extra 0.05 mm allows for that. Colin

Thread: Year of Engineering
15/12/2018 17:34:51

Qualified engineers are a highly intelligent but too reserved species which is why they are not rated as highly as doctors or lawyers by society. Everybody uses engineered equipment The misuse of the title "Engineer" is another reason for lack of appreciation by the average person. We need to greatly promote knowledge of the skills and mathematical abilities of people entitled to call themselves "engineer". Colin

Thread: Pro’s and cons of owning an horizontal milling machine
11/12/2018 19:12:42

Over many years my ex- scrapheap horizontal flat belt Clarke mill has often been very useful for cutting thick (3/8 to 2) inch steel plate that is too big to fit into my bandsaw. It has been used many times to turn 24 inch and bigger wheels. It's not a massive machine, with 18" traverse, but it is amazingly rigid. I also use the larger end mills and face mills with the job on its side. Very useful machine. Colin

Thread: Using wood on a metal lathe
15/09/2018 12:08:06

I have often turned wood on my metal lathe ,it needs a very sharp high rake tool preferably a high speed and works best on hard woods. Colin

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