Router Cutters

[jonm]

george
the rdg tools are all hss cutters, better to go a few quid more for carbide. better cut , last longer

[Karl]

Recommendations please for UK sources of V-point router bits (with a real sharp point - I've got plenty with a 'flat' point) suitable for engraving oak. Many thanks.

I think I'm looking for something like this: http://www.amazon.com/CMT-858-001-11.../dp/B000P4NSYG.

[battwell]

titman or itc are the best. both very sharp and last ages

[Dairsie]

The spiral cutters are good for solid woods, they can come in both down cut good for deep work shaping or up cut (watch jigs and depending on depth you may need clamps), they can also come in roughing and finishing form also. I like to go for thicker shafts as possible on my cutters for heat dispersion and stopping the fracturing.

As for jigs I make for nesting etc I use Birch ply and more often than not 25mm thick. MDF lets vacumn straight through and you loose some suction-try a sheet of paper on mdf to see it in action, to prevent it you must coat your mdf with glue/paint etc. The ply does not need any coatings and the jigs last longer, ply has cross banding grains between the layers, the edges do not leak either accordingly.

As for cutters I purchase replacement tip types as these keep up the quality in moulding and work performence, they work out cheaper in my industrial setting anyway but are of course more expensive to purchase new, I usually buy two bits where I used to buy three of each size in single/double flutes to keep up production and always have one on the machine. Tips cuts this out as they are always available and the second bit is if I have a mishap and I need production to remain uneffected.

I stopped grinding my own cutters and heads some years back. I find now that repalcement tips on my heads is more efficient and gives me better quality of mould. I replaced my Weinig Unimat with a powermat with CNC auto heads/tool/mould auto recognition and quick change facility, the tips was the way to go for me as the Powermat needs a grinder to do profiles greater expense, replacement tips like I have now was the way to go for me. The quality and setup times have given me greater efficiency between quick changes.

[GeorgeD]

The thing is....carbide is for hardened steel and HSS should last pretty well for plastics and wood so whats the use in buying a more expensive endmill if thats all its cutting? providing the cut is in stages and not too deep each pass they should be up to the job.

Its the same with normal wood router bits,the more passes you use the less chance of the bit burning out in a short time.

[John S]

The thing is....carbide is for hardened steel and HSS should last pretty well for plastics and wood so whats the use in buying a more expensive endmill if thats all its cutting? providing the cut is in stages and not too deep each pass they should be up to the job.

Its the same with normal wood router bits,the more passes you use the less chance of the bit burning out in a short time.

Not quite true George, although they are softer than steel, some materials are very abrasive and will eat HSS is short order, Tufnol is a plastic but believe me a carbide cutter will outlast 7 or 8 HSS ones.

Printed circuit board is another, on a decent sized board you will be lucky if one HSS isn't burnt out at the end and it not all about deep or aggressive cuts.

When cutting softer materials the trick is to get the chips away to stop secondary cutting and clogging, this is where single flute cutters score as they have the most clearance of any cutter and most single flute cutters these days are carbide.

[jonm]

george
majority of normal router bits are carbide . you say hss bits " should be up to the job" do you have a cnc router up and running to try out hss v's carbide
or are you just guessing . cutting wood carbide will outlast hss , hence its cheaper in the long run

[TheChunk]

The thing is....carbide is for hardened steel

You'll find in industry that carbide tools are used in various grades, geometries, coatings etc. for cutting just about any material you can think of, not just hardened steel.

[bogstandard]

Root thru this chaps offerings for small carbide router bits, very easy to deal with and cheap postage from the US. His stock changes all the time.

http://shop.ebay.co.uk/jtg1969/m.htm...&_trksid=p3686

For full sized cutters, I use this chap all the time. Postage for an order usually comes to around a tenner (depends on weight), delivered within about 10 days, and always sends them as a gift. Never had to pay duty yet.

http://richontools.com/index.php?mai...index&cPath=15


Bogs

[battwell]

i machine semi profesionally.
i use all types of cutters depending on the job
high speed steel is great when cutting softwoods as you can get a sharper edge to the blade. cutting speed/chip load being correct or the blade will dull very quickly.absolutely useless on mdf , laminates and some hardwoods, they are so abrasive the cutter will be blunt in no time.
carbide tipped. great for general work on softwoods, hardwoods, mdf etc. the cheapies are ok and are considered disposable, however if you get some cheap diamond card files (about £2 off ebay) you can redress the edge a few times. (ive had more trouble with shanks snapping than blades blunting)
Solid carbide. the same sort of finish but seem a lot more durable. i have 3 roughing spirals i use daily which give a very nice finish and will cut through anything!
pcd. (diamond) cost a fortune to buy but will outlast anything as long as you dont drop them etc! ive had one 45degree chamfer cutter on my big router for 3 years cutting edges every day on laminates, hardwoods.
the worst thing for any cutter is running it at the wrong feed speed (too slow) this causes a heat build up and can kill any of them quickly. a lot of my tooling requires feed speeds of 5 to 8 metres per minute!
this is an example of correct cutting speed with a 12mm spiral in oak.
http://www.youtube.com/watch?v=8O391...eature=related
obviously a lot of hobby machines wont run this fast and require smaller tooling. (this is my hobby machine just been converted to mach 3 ) when you find your not breaking tools any more and you want some extremely sharp top quality cutters have a look at itc tooling. search google
they are not cheap (approx £20 for a 2mm cutter but the quality is superb)