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Member postings for Clive Hartland

Here is a list of all the postings Clive Hartland has made in our forums. Click on a thread name to jump to the thread.

Thread: Tank Tracks
24/06/2011 22:30:17
Tank tracks are made from Chrome Molybdenum steel and are cast.
The track pins make excellent chisels, tough and durable.
They have to be very durable as they carry vehicle wieghts of about 60ton on all types of terrain up to speeds of 40mph.
Tank tracks are of two types, 'live' and 'dead'.
The 'live' type have rubber bonded links that spring the track, hence the term 'Live'.
To keep the tracks flat the pins are hexagonal so as the track goes around the hubs it flexes on the rubber bushes of which there are about five or six in each link.
The 'Dead' type of track was the type used on Russian tanks and laid itself flat on the road wheels as it was carried around the hubs. The links were like flat cast slabs and had round pins.
For model purposes the requirements are not so severe as the model is small and light. Modelling the 'Live' track will be very tedious as the links would have to be joined with rubber bushes to be lifelike.
The Bren Gun Carrier had quite light tracks of steel and because of the type of springing involved the track was quite loose.
I think perhaps it would be possible to do die castings of track in a white metal, remember you need two or three hundred. Then using a jig, drill them and fit the pins.
Pins are retained with ring clips that are sprung over a taper on the pin into a groove.
There is a washer with a groove that the ring clip sits up against. This helps to retain it in place.
A very tedious project making tracks!
Thread: Super Glue & Balance Springs
15/06/2011 07:12:43
Because the nail polish remover is not pure, it has oils added to stop the spirit damaging the cuticles.
Unfortunately its hard to get Acetone in small quantities.
Perhaps buy the specialised super glue solvent!
Thread: Myford chucks
11/06/2011 21:23:23
Mark, they should go right up to the face of the mandrel.
If they do not then re-clean the male and female threads and try again.
If you still have trouble then using a cotton wool bud apply a smear of blue on the male thread and plain part and see where it is catching.
I have noticed on my 3 jaw chuck some slight scrape marks inside the plain part of the chuck body as if someone has relieved the plain part!
I dont use any lubricant on my chuck threads at all. The only part I clean and lube is the scroll and jaw teeth. For this I use a stiff graphite grease.
Under no circumstance try and force the chuck onto the mandrel, it should go very easy if clean.
Thread: How to dress a small diamond wheel
10/06/2011 19:42:20
To expose new grit on a stone wheel you should a Star dresser which has a multi head full of spiked metal wheels. These dig into the matrix and remove the bond and exposes new grit.
Using a diamond dresser on the wheel only smooths the surface and trues its shape and in fact lessens its ability to cut.
With a diamond wheel it depends which sort, a rubber bonded type will only burn if done with a stone and the harder type of bond will have diamond grit pulled out of the matrix.
I have not yet happily dressed a diamond wheel! Preferring to let it do its work gently and slowly and not forcing a tool being sharpened.
Thread: Using Micrometer/Hi-Spot blue
10/06/2011 14:35:35
Working in the Instrument repair business I have only used the Laser as an alignment tool.
Mainly aligning the graticule of an optical system to the laser so that the beam can be projected to a distant point. Actually using the laser as a surface/level device is very crude and not accurate at all. Even in industry it only works to about 2.5mm tol. over 50mtrs. Laser beams are highly diffracted and hard to determine the centers. If the beam hits the graticule it will diffract and special grats. with the no markings in the center are used.
Examples are boresights for setting up gunsights and aligning the weapon to the mount in an aircraft or fixed mounting.
Another example is for Zenith and Nadir optical plumbs for mines and lift shafts.
Also used for the run of drainage beds to allow for the fall of the drainage.
Mention is made of Autocollimation which is accurate and the readings are half the reflected image.
Lots of applications use autocollimation such as a long line of rollors in a mill and alignment of structures in ship building. Specially made Theodolites with stiff axis are used and they can be mounted sideways/rightangles on a bulkhead.
Personally I have used Auto collimation to survey the bed of a ships engine that threw a con-rod, this distorted the crankshaft and that then distorted the bed.
I measured the bed every 300mm and also did it across the bed and was able to determine that the bed was shaped like a banana with a max. error of 237Thou. dip in the middle and that one side was 180Thou. higher then the other.
The Insurance paid out for a new bed and a new crankshaft.
There is a long story about this engine and the ship and when it happened.
The simplest method is a theodoilte with an autocollimation eyepiece fitted and a Titanium mirror fitted to a levelled mount or cube which is absolutely square and can be put in any position.
Examples of this are aligning Head up Displays in aircraft and some aircraft and ships weapon systems.
Back to scraping, part of my training was to scrape Inspectors Clinometers, this entailed scraping the base and then using a ground square, scraping the end face. The material was Bronze and it was easy to overscrape and make it worse. Then I had to stone the cam that rode the underface of the drum and this was all checked on a master Clinometer with a long swinging arm.
Later I was faced with levelling the trunnions of Theodolites, this I did on a face plate and lapped them in until there was no Tilting Axis error. This faceplate had little quarter inch squares and was loaded with diamond paste.
Later I lapped another surface plate to it and trued it up and I still use that plate today.
Optical flats are for determining the quality and flatness of a surface, can be used to see if the anvils on a micrometer are square to each other. They are easily scratched and can soon become useless. I only used them for inspection purposes.
Thread: Scale turnbuckle connectors for Three and half gauge loco
08/06/2011 13:33:07
Thank you very much Stick, thats just what I need.
Regards, Clive.
07/06/2011 21:15:38
I have searched high and low for drawings of the Turnbuckles for my loco.
Does anyone have sized drawings of these for the above gauge?
Thread: Super glue (cyanoacrylate)
03/06/2011 08:22:59
Rather than buy the cheapo stuff in the £1 shops go buy the Engineering adhesives, the containers are always full.
I agree that the small containers are near useless and have no shelf life and the adhesive qualities are suspect.
Yes, its all a rip off I am afraid.
Try Goldfish flakes, at £2.70 for 10grms. To save you working it out its £270 a Kilo.
Thread: Axle box lubrication
01/06/2011 21:55:36
On my Evening Star there is a hole drilled through the axle to a cross hole in the axle where it sits in the axle box. Grooves and other holes will let the oil move around.
The book suggest pumping thick oil through the hole which should be easily accessible from the side of the wheel.
To me this would have the effect of flushing the bearings and the axle box.
It just needs a pump with a cone that will go into the small hole.
Thread: Ultrasonic Cleaners - Experiences? Any Good?
31/05/2011 14:12:12
Here is a follow up on the MICRO-90.Aqueous Cleaning solution.
This is distributed in the UK by:-
International Products Corp.
Unit 5
Green Lane Business Park
238 Green Lane
London SE9 3TL 020 8857 5678
Web address. saleseurope@ipcol,com
31/05/2011 07:50:36
We do use a small qty of White Spirit in a container to clean out small brgs. Care is taken not to contaminate the aqueous solution and then only for a minimum of time.
The container I let sit in the basket slightly tipped over and it seemes to resonate OK and you can see the fluid turbulating as it cleans.
Then the components are washed in detergent and put back into the tank in the normal way to complete the cleaning.
Thread: New technology in Model Engineers Workshop
30/05/2011 21:40:52
Because its machine polished, big rotating discs swilled with water and abrasive are run backwards and forwards over the surface.
Some times slabs are cut from the solid material with big carbide teethed saws.
Thread: Cutting tip for hole cutter
30/05/2011 19:50:30
I found it cheaper to buy a kit of those multi teeth circular cutters from Screwfix for about £8.00.
They are great and cut holes in all the materiels that I use.
I doubt I would ever use a single cutter type again.
Thread: Ultrasonic Cleaners - Experiences? Any Good?
30/05/2011 16:17:18
Interesting tale, I worked in a place that had a simple wash bath with Trico. and on a hot day you could see the vapour pouring out over the edge of the container.
One consequence was that your feet got cold! I put a lid on later.
We used it for cleaning the parts of Creed Teleprinters. Oh, and we had no creepy crawlies in the shop, it must have done them all in.
When the Freon and Hcfc's were fazed out I was in touch with Dupont and ICI and both of them were sure that there was no replacement for the Freon in the forseeable future.
Our throughput was at least 80Ltrs a month and it was very expensive. I had a still that would clean up all the waste Freon but I never got 100% back.
Later I found out that the Japanese were buying all the Freon and Hcfc that they could lay their hands on, wheather clean or dirty. I often wonder what they did with it?
30/05/2011 10:54:04
I have had extensive experience with Ultrasonic tanks in my career.
They are absolutely essential in the manufacture of small instruments and some optical components, in the past they used Freon and CHFC, but these are now banned and in the main only Aqau based cleaners are used.
I will come back to these in a moment,.
The use of Tricorethyline is banned but in the work I do now we use a white spirit pre-wash that gets rid of the dirt and grease, it is then essential to get rid of the white spirit by washing in hot water and detergent. Otherwise it pollutes the ultrasonic tank.
Only then do we put it in the Ultrasonic tank for the final clean. The timings are about 3 mins normally.
The Aqua solution is made up of a 2% solution of a product called 'Micro'. At this moment I do not have the details of the UK supplier but can post tomorrow with those details. It is very economic and we change it once a week or if the brass bits come out stained.
Micro is used by the US Atomic energy Commision to clean nuclear components so it has a better cleaning residue number than Freon.
Care should be taken at all times to stop pollution of the tank, no dumping of greasy black objects straight into the tank.
I have a tank at work that takes 13ltrs of water and it has a heater and condensing tubes that return vapour back into the tank. We use baskets to contain the items as they are very small sometimes and the oscillations will wear away bits if in contact with the base of the tank.
For your question is it worth it, if you have a continuos flow of work on a daily basis or even weekly then 'Yes' go for it.
I found it useful when doing the pre-clean for my Worden before 'Blacking'.
Thread: Sieg Super X3 advice needed!
29/05/2011 09:10:08
The price list I have is headed at the top, 'EmocMachine Tools'
The sub heading for the milling machines is headed, 'Wabeco'.
That is whet I missed as my eyes were dran to he machines and specs.
They seem to have a good range of machines and CNC is listed as an upgrade also longer beds and DRO's.
Very expensive though but if its quality then its worth it.
28/05/2011 21:39:13
Sorry about that, I have an Emco catalogue and and looking at it again I see how I got mixed up.
Thread: Marking out punched numbers
28/05/2011 17:14:11
Hugh, I too have just finished the Worden. What I did to give a good finish to the plate was to use a sanding machine, the type that has an oscillating pad. The machine has an oblong base and the sanding sheets are attached with clips at each end.
It gives a very fine scroll finsh on the plate and takes off the rough bumps.
I have not filled the numbers on mine as they seem legible enough anyway. If you want the numbers to stand out then fill them and let it dry for some time before you sand off the plate.
Take care when you make the plate that the collar and screw are fitted. You have to turn a circular 15 deg. end to it. Marking the zero position and the two marks iether side, make sure they are accurate as you cannot see the zero position when the micro collar and knob are fitted and you have to rely on the other two marks to set the plate.
Do not paint the base or side plates as the paint will cause sticking and it will be hard to move.
I made all my bars the same length and had no trouble with that part.
Thread: Sieg Super X3 advice needed!
28/05/2011 08:37:50
Mention is made of the EMCO series of mills, has anyone bought and used one?
The F1200E seems a good one and i am sorely tempted to get one.
I am not particularly interested in power feeds but maybe a DRO later.
Any insight would be interesting to me.
Thread: Machining what am I doing wrong?
24/05/2011 22:16:17
I will tell you a tale of a man who came to us and proffessed to know all about maching being skilled on Mills and lathes.
He went to the lathe and all I could hear was swear words and I could see clouds of cigarette smoke as he puffed vigorously, I leaned over his shoulder and could see he was running the lathe backwards.
I said nothing and walked away and vowed not to ask him to do any work for me.
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