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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: Holding screw-end end-mills/slot-drills
19/11/2019 12:28:30

ER collets have a wide clamping range for each nominal size but you should use one that is the correct size for strongest grip. Colin

Thread: DIY glass fibre pulley?
06/10/2019 10:50:41

My lathe and horizontal mill both have three step flat belt pulleys that I made many years ago from sheet metal discs with welded on sheet metal bands for the belt to run on. Tube is welded though through the centre. Perhaps I was lucky as they both ran very close to true. These pulleys have a largest diameter of about 9". Colin

Thread: Hand or Machine Reamers?
04/10/2019 13:48:30

Hand reamers are only useful for opening holes such as little end bushes in situ where it can't be done on a machine. Colin

Thread: What are members thoughts on Gap Bed lathes ?
04/10/2019 13:39:49

I would always prefer a gap bed lathe for its versatility. Colin

Thread: Why does the micrometer have a second knurled segment
05/09/2019 14:29:35

When you have acquired the skill after frequent use you will find the "second" knurled knob gives a better feel on precision work and also that feel lets you know if a bit of debris is causing a false reading. Colin

Thread: 0.300" & 0.400" 28TPI Tap
27/08/2019 15:41:17

BSP 28 tpi threads come close. Colin

Edited By colin hawes on 27/08/2019 15:42:11

Thread: Adjustable 3-jaw chuck designs
06/08/2019 10:29:12

I have a cheap 3 jaw chuck that is quite accurate on some diameters of stock and much less on others, the accuracy varying between 0.001" and 0.005" T.I.R. Having checked the parallelism between register, back plate and chuck faces I come to the conclusion that the scroll is likely to be the cause of the variation so it seems that for one-offs I might as well use an independent four jaw chuck as attempt to adjust the self centering one...……I am hoping to improve things now that I have discovered small burrs on the scroll Colin.

The scroll needs to be checked for radial slackness.

Edited By colin hawes on 06/08/2019 10:33:04

Thread: Do you use Chinese HSS?
29/06/2019 10:30:00

Be wary of the description HSS. It's been used as a suppliers name in the past. Colin

Thread: What method do you use to find center height for your lathe bit?
29/06/2019 10:26:02

Estimation followed by adjustment if necessary. Colin

Thread: Do you clean your workshop at the end of the day?
29/06/2019 10:21:27

If I am doing intricate work I tidy all around that area first otherwise something is certain to disappear but I do keep the machine surfaces wiped clean. I do the floor if I think it needs it. Colin

Thread: Can We Be Too Good For Our Own Good - sometimes|?
21/06/2019 11:12:20

A company where I worked had frequent trouble with a radial drill motor randomly blowing one or more of it's three fuses. Electrical maintenance people were called in several times to solve the problem, checking everything with their test equipment and finding no fault as the motor would always run again with replacement fuses and their conclusion was that a rewind was required. I took the motor apart myself ( with some difficulty) and found the stator and rotor almost seized with accumulated sticky debris from years of use. It ran faultlessly after that was cleaned off.

Thread: The shape of cutting tools.
17/06/2019 11:11:04

Excellent training film. Colin

Thread: Free cutting mild steel
17/06/2019 10:57:15

Yes....and make sure you keep the tools sharp. Colin

Thread: Threading Problems on Colchester Student
17/06/2019 10:53:19

I don't know the exact design of this machine but the sort of things I would examine are : can the half nuts move? are there missing teeth in the gears? Has the shear pin partly failed? I would not expect end float on the leadscrew to be the cause of your problem. Colin

Thread: Myford/ Drummond M Type chuck back plate.
02/06/2019 12:12:27

I have machined 24 notches on my backplate for dividing purposes. Colin

Thread: Hostaform, Nylon or Steel For Mini Mill Gear?
29/05/2019 15:33:14

Thank you Ketan for that information. Colin

29/05/2019 14:59:56

Does the control board have no overcurrent / overload protection then? Just a question . Colin

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.

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