turning

Turning is a machining process in which a cutting tool, typically a non-rotary tool bit, describes a helix toolpath by moving more or less linearly while the workpiece rotates. The tool's axes of movement may be literally a straight line, or they may be along some set of curves or angles, but they are essentially linear (in the non mathematical sense). Usually the term "turning" is reserved for the generation of external surfaces by this cutting action, whereas this same essential cutting action when applied to internal surfaces (that is, holes, of one kind or another) is called "boring". Thus the phrase "turning and boring" categorizes the larger family of (essentially similar) processes. The cutting of faces on the workpiece (that is, surfaces perpendicular to its rotating axis), whether with a turning or boring tool, is called "facing", and may be lumped into either category as a subset.
Turning can be done manually, in a traditional form of lathe, which frequently requires continuous supervision by the operator, or by using an automated lathe which does not. Today the most common type of such automation is computer numerical control, better known as CNC. (CNC is also commonly used with many other types of machining besides turning.)
When turning, a piece of relatively rigid material (such as wood, metal, plastic, or stone) is rotated and a cutting tool is traversed along 1, 2, or 3 axes of motion to produce precise diameters and depths. Turning can be either on the outside of the cylinder or on the inside (also known as boring) to produce tubular components to various geometries. Although now quite rare, early lathes could even be used to produce complex geometric figures, even the platonic solids; although since the advent of CNC it has become unusual to use non-computerized toolpath control for this purpose.
The turning processes are typically carried out on a lathe, considered to be the oldest machine tools, and can be of four different types such as straight turning, taper turning, profiling or external grooving. Those types of turning processes can produce various shapes of materials such as straight, conical, curved, or grooved workpiece. In general, turning uses simple single-point cutting tools. Each group of workpiece materials has an optimum set of tools angles which have been developed through the years.
The bits of waste metal from turning operations are known as chips (North America), or swarf (Britain). In some areas they may be known as turnings.

View More On Wikipedia.org
  1. S

    Boiler not turning off

    Hi there I've got a Valliant echo plus 28 combi boiler and what I've noticed is that when I set the thermostat target to say 20 it keeps on going( not everytime tho) I changed the stat to a nest thinking that might be the problem but noticed that again when I set it to 20 I would look an hour...
  2. H

    Hot water turning on issue

    i have a hot water tank and gas boiler and for the last 4 months my boiler turns on when I use some of my hot water like it’s reheating the bit I just used. This wouldn’t normally be an issue but my entire heating system is set to off for the summer. How or why is my boiler reheating the hot...
  3. G

    Radiators Turning on when should be off

    Hi all, any help appreciated on this issue I have done a google search and I see that there could be an issue with the 3 port valve or more uncommon a reverse circulation issue. The Boiler model is the I-Mini C30 and the problem seems totally random, it started in the middle of the night once...
  4. G

    Hot water turning off in summer

    My Halstead Ace High combi boiler has been intermittent with the hot water. There's no hot water tank so I have to turn the hot tap on high to get the flow going before the boiler kicks in. Then after a few minutes the boiler shuts off and eventually comes back on, then off again, etc all while...
  5. G

    Inline pipe valve/taps dripping after turning off and back on

    I’ve recently moved into an old house and I’ve just replaced the immersion heater in a copper cylinder. The problem is that, to stop the tank from refilling I turned off two pipe valves (not knowing which did what) and now I’ve truned them back on they’re both dripping. How do I stop the...
  6. S

    Noisy vibration in pipes when turning shower on

    I recently had a new combi boiler and thermostatic shower bar valve installed. There is a loud vibrating noise of the pipes for a few seconds when the shower is turned on. I have switched the bar valve for a new one and the problem remains.
  7. T

    Gate Valves turning - or are they balls?

    hi, Well that’s the new pump and gate valves in. These are the valves Pegler Pump Valves 22mm x 1½ Should they just be turned 90 deg? Or open them until they stop? Many thanks!
  8. R

    Old boiler turning itself on at night

    Hi all, Strange query here...! I recently replaced my timer/programmer thanks to the help of folk on here. I now have a Drayton lifestyle 7 day programmer, a Honeywell junction box, and a very old but well serviced and working Potterton Kingfisher MF boiler. Recently (Not just when cold...
  9. E

    Ideal istor thud/case vibration when turning off

    Hello all, I know the boiler doesn't have the best reputation but its generally worked well over the last 5 years or so. Having said that, I've recently noticed the boiler is making a thud and the case vibrates. The boiler is on a service plan until tomorrow with Homeserve and the chap that...
  10. M

    How to turn off towel radiator

    Good evening all, I have two towel radiators that are part of the central heating system that I cannot for the life of me figure out how to turn off/on. There are two white caps at the base of the radiator on either sides of the radiator as followed: and... When I remove these two...
  11. S

    Heating ground floor not turning on

    My ground floor heating system not turning on and up stair heating and hot water is working ok. Please find the attached my system.
  12. B

    Turning off Hot Water

    My third thread of today... :) I need to turn off both my cold and hot water to change some taps. From what I've read in a book I have, I have a unvented system and therefore turning the cold water off will turn off the hot water. From the picture below, I believe turning the valve where the...
  13. S

    Rayburn 400kpf

    Hi all, We recently moved house that has a rayburn 400kpf. There's a couple of issues I'd like to try and resolve. Firstly when turning the Rayburn on from cold, it runs for 2-3mins then cuts off as tho upto temp. Move the temp dial down then up it starts again. But only for a minute before it...
  14. J

    Mixer Tap cold water supply seized - advice required - picture added

    I have been trying to fix the shower in my en-suite and after swapping the thermastatic valve with 1 in a different room I realised that the mixer tap was not turning the cold water feed and it looks to be seized. I did manage to insert a piece of metal into a slot on top and move it slightly...
  15. U

    Worcester 28i RSF

    The DHW is working intermittently. It works most often if the whole combi-boiler has had some time to cool down. If I run the hot tap for (e.g.) a bath, if I get the hot water in the first place, turning off the tap and then turning it back on usually results in cold water. There is an...
  16. I

    Vaillant Ecotec plus - Pressure Low and wont fill up

    Hi guys, Woke up this morning to no heating and hot water. Looked at boiler and pressure was low. Tried to top up using taps underneath but nothing flows through. Disconnected braided pipe and turned on and water comes through. I will call engineer out, but wondered if there was a way of...
  17. G

    mono basin mixer tap issue

    I have fitted a mono block mixer tap to my basin and are having issue when turning the cold water on. A noise comes from the tap even when using the mixer, but the hot water is silent. I have done the following: removed and cleaned the cartridge. still no change in noise. flushed out the tap...
  18. S

    How to take apart Secta basin mixer tap

    Hello, Hoping someone can help me. I have a Secta bathroom mixer tap from Victoria Plumb https://victoriaplum.com/product/secta-basin-mixer-tap27 and i've taken off the top of the right hand tap but i can't for the life of me work out how to get the sleeve off the tap fixing. In the picture on...
  19. wildcard

    tap removal again!

    I"ve taken out the tails now so you can see.At the end of that long stud is a 5mm allan socket,happy days I thought.The stud will not budge.had grips on allen key,had a 5mm t bar on it.All you can hear is the metal grinding on the china as there is no rubber washer fitted. They have the same...
  20. G

    Banging pipe when neither hot water or heating is on, please help

    I hope someone can help, we have a banging noise at night, it does happen during the day but other noises cover it up. we here a click from the kitchen and then a banging noise which you can here on the front wall of the house. the bang is evenly spaced apart with a bang every four seconds and...
Top Bottom