Search the forum,

cold feed

A cold saw is a circular saw designed to cut metal which uses a toothed blade to transfer the heat generated by cutting to the chips created by the saw blade, allowing both the blade and material being cut to remain cool. This is in contrast to an abrasive saw, which abrades the metal and generates a great deal of heat absorbed by the material being cut and saw blade.
As metals expand when heated, abrasive cutting causes both the material being cut and blade to expand, resulting in increased effort to produce a cut and potential binding. This produces more heat through friction, resulting in increased blade wear and greater energy consumption.
Cold saws use either a solid high-speed steel (HSS) or tungsten carbide-tipped, resharpenable circular saw blade. They are equipped with an electric motor and a gear reduction unit to reduce the saw blade's rotational speed while maintaining constant torque. This allows the HSS saw blade to feed at a constant rate with a very high chip load per tooth.
Cold saws are capable of machining most ferrous and non-ferrous alloys. Additional advantages include minimal burr production, fewer sparks, less discoloration and no dust. Saws designed to employ a flood coolant system to keep saw blade teeth cooled and lubricated may reduce sparks and discoloration completely. Saw blade type and number of teeth, cutting speed, and feed rate all must be appropriate to the type and size of material being cut, which must be mechanically clamped to prevent movement during the cutting process.

View More On Wikipedia.org
Recent contents Top users
  1. S

    Mains connected to bath through a hot and cold feed pump

    Hello I have had a toilet put in and the plumber modified the feed to toilet connecting it to mains and in doing so the feed to the jacuzzi bath which is filled by gravity feed through a hot and cold combined pump, became mains fed, a few days later while using the basin in the bathroom the...
  2. P

    Cold feed pipe

    Why does the cold feed in a heat only boiler installation get looped just after the open vent ?
  3. S

    Boiler Cold Feed Isolating Valve

    Hi All, I was wondering if anyone can help me? I am in the process of changing taps in the bathroom but came across a problem. I can't seem to be able to isolate the water coming into my property. I have turned both stopcocks in the both bathroom and kitchen and the water still flows...
  4. S

    Bunging the cold feed and vent

    Whats the point of this when you want to change a rad and re-pipe? All it does is hold the water in the f and e tank. The existing rad pipework drains anyway with the pipework under the floor and when re-filling the system if there is any carp in there this will still drop into the pipework...
  5. M

    blocked cold feed

    I haver never seen a 22mm choked up this bad before. And this is apparently after a flush a couple of yrs ago. Which they had because water wasn't getting hot. But, the little hole actually did end up heating the cylinder. Replaced with an 824. Couldn't see any rubber hoses inside?
  6. P

    Non return valve on header tank cold feed

    Hi, just a quick one (I hope). Could a non return valve placed on the cold feed from the header tank cause pumping over from the vent pipe when the central heating circulating pump is on? Thanks, Pat
  7. C

    Bad air lock in cold feed

    had a call today, hot water dribbleing out of taps, went to address to fint once tap was left running for around 6 seconds water would slow down to nothing, so thaught it would be a blockage, so undin every joint in cold feed to find it all clear, then in the hot pipe to the first tee, all lear...
  8. N

    Branching off cold feed to combi boiler

    Hi all I am a bit stuck as to the optimal arrangement of pipework of the incoming mains feed prior to arriving at a combi boiler. I have an 25mm MDPE supply pipe with a 25->22mm brass stoptap fitted as it enters the kitchen(not below the sink, sink on adjacent wall 4m away). The boiler will...
  9. S

    Feed for 2 showers - 15mm series or parallel from 22mm hot and cold feed?

    Just want to check something before I proceed with a re-piping exercise. I am fitting a new thermostatic shower in the bathroom which is fed from a balanced unvented hot water system. I have another shower in the en-suite where the hot and cold feeds are both 15mm teed directly from 22mm...
  10. J

    Header tank filling through cold feed.

    Need some help with this one. Have an old 3 pipe system in a pub Which fills the header tank via its cold fill and subsiquently overflows. The cylinder is 2 years old as it was replaced due to to splitting its also had the cf and ov moved to correct location behind pump. It's also had a pump and...
  11. M

    Cold feed to unvented cylinder

    Hey I am currently studying for my level 3 at college and learning about unvented hot water systems. I have a question about the cold feed to these cylinders if anyone can help. I know it need a composition valve on it which contains an in-line strainer and pressure reducing valve. And a...
    • Mark
    • Thread
    • cold cold feed cylinder enough pressure tundish unvented unvented cylinder valve
    • Replies: 10
    • Forum: Plumbing Jobs | The Job-board
  12. G

    Combined cold feed and vent

    Hi I have always been used to installing central heating systems with the typical H section with cold feed and vent no more than 150mm apart. (As I was taught in colledge and how other heating engineers I have worked with have done it) But recently I have been running into more and more...
  13. kozak1968

    cold feed blockage

    Can the techno heads can explain why the vent and cold feed on an open vent system gets blocked up. Thanks
  14. L

    Blocked cold feed

    Hi all can anyone tell me the symptoms of a blocked cold feed??? the chap that is training me either don'y know or didn't want to explain. thanks
  15. A

    cold feed and vent

    Came across a cold feed today from an f and e tank teed into vent from boiler, was this acceptable in the older days, system was being ripped out so no danger, just couldnt quite get my head round it.
  16. S

    Cold feed supply to unvented cylinder

    Hello, I work for a large heating firm and have fitted many unvented cylinders for them (I am certified to fit them). However on a new job an unusual problem that I haven't come across before has come up and I have been though all my books, etc and can't find an answer. They want me to fit an...
    • solarplumb
    • Thread
    • cold cold feed cylinder issue shouldn't storage supply unvented unvented cylinder which
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  17. R

    Water hammer causing humming in main cold feed pipe....Please help

    I have recently had a new Oso mains pressure tank installed.Since the installation i am getting a dreadful humming in the cold feed pipe when opening or closing taps or using toilets.It can be intermittent but normally happens a few times after using a tap.The Plumber who installed the new tank...
    • racdan
    • Thread
    • causing cold cold feed hammer help humming main noise valve valves washers water water hammer
    • Replies: 22
    • Forum: Plumbing Jobs | The Job-board
  18. B

    Does my washing machine have a hot or cold feed?

    Hi, I am trying to work out if my washing machine has a hot or cold feed as the plumber has asked me to find out. The product i am referring to is show below: LG Direct Drive 8kg 1400rpm Freestanding Washing Machine F1481TD5 - Kitchen Appliances Direct Please can someone help me out? Many...
  19. M

    cold feed to cyclinder 2 many bends?????

    Have a look at this guys! Customer wanted his cyclinder moved across his hotpress, i explaned to him if i move it he will lose pressure because of extra bends in the cold feed pipe work! He said to go ahead and do it, and if the pressure is to low he will get a pump fitted! Anyway have must...
  20. N

    blocked cold feed?

    Went to see a late job today which was basically a toilet not filling. Had a look and no valves, no kinked flexi, all seemed ok. Now that bath is tiled in - great! so was going to drain down CWS cut in just before boxing in, add ballofix and refill, that way I would know what side the blockage...
Creating content since 2001. Untold Media.

Newest Plumbing Threads

Tile Cutters
Tiling Advice
Tiling Forum
Tilezine Tiling News Tile Association
UK Tiling Forum
Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock