StarrettTCT Deep Cut Hole Saws , 20mm

Needing to cut a 38mm (1 1/2") hole in 5mm plate steel, I searched the internet for the right drill bit and settled upon this Starrett CTD38. Having some limited experience of tungsten carbide cutting edges (PCB fibreglass board cuttting by repurposing a simple carbide-edged tile cutter), I decided to "invest" in this carbide drill bit (yes, it is relatively expensive compared to other metal hole saws).The results have been as expected: a very neat, clean cut (using 500rpm, ample cutting fluid and moderate, slow and deliberate pressure in a bench drill press). I measured the resulting hole to be approximately 38.7mm [i.e. less than a nominal 38mm+2%] - which is impressively consistent considering I used a cheap Chinese drill press that is a few years old from machinemart in the UK!).There are other hole saws out there, and certainly cheaper than this item, but for finer tolerances, clean cuts (no deburring is needed) and longevity (carbide edged), I'd give this a strong recommendation.It was even delivered with 1-day shipping to arrive on a Saturday with Amazon Prime.

I can not even express what a piece of junk this hole cutter was. It wasn’t even cheap! I needed to cut 4, 20mm holes in 5mm steel plate. I thought this would fly through. So, pilot hole drilled, drill on slow, cutting fluid used, gentle pressure. Did everything right. Within 5 seconds every single tooth had snapped off, honestly!Do not waste your money on this, I missed my return date as well as I wasn’t ready to drill holes straight after buying. Awful cutter!

Be careful with this cutter as it grabs when new but it has excellent longevity and if treated right will last you years

I've had a few of these in different sizes and they're unbeatable when drilling straight and slow.Occasionally I find myself in tight confines, where a holesaw simply won't fit, and use one of these to get out of a hole (no pun intended). If this requires drilling at an angle, then it's a matter of sacrificing the cutter as no amount of lubrication is going to save it.Bad reviews seem to be posted by people horsing these cutters roughly through steel, in the sort of manner one might treat a bi-metal holesaw, and that's not what they're designed to do. To be fair; I've had one instance of a tooth shattering on initial contact with metal, but otherwise these cutters are animals, provided they're treated with manners.

Well made and holds edge well but does tend to bind on the plug a bit. But I was drilling through fire proofing paint to get to steel and the paint might be the issue.

Lasts so long .

Had a few of these from my wholesalers and they lasted for months with daily use on heavy duty aluminium. I got two more from here and the teeth snapped off in a few weeks. When holding them side by side there are slight visual differences. Regardless of this they are still pretty decent for low to mild use.

I don't know how long these cutters have been about but I tripped over them for the first time when I needed to cut some 18mm holes in 4mm steel plate. Conventional hole saws don't usually come that small and trying to drill plate this thin with a 18mm twist drill is not really very satisfactory. This cutter did the job a treat in a drill press and felt as though it would even have been OK in a hand held drill. No issues at all at breakthrough. It needs plenty of lubricant but cuts like a dream and looks as if it will last forever with tungsten carbide teeth brazed to a one-piece steel body. Construction of the tool is suburb - I think the body is an investment casting and the removable pilot drill is secured with a meaty grub screw. Really good product. I've now found that they are made in 1mm steps from 15mm upwards. I have ordered several more sizes for when I need them.

Prodotto professionale, progettato per essere usato con un trapano a colonna, a mano, anche a causa delle placchette in WIDIA, è impossibile mantenere la planarità del piano di rotazione con conseguenti danni al pezzo ed all'utensile. E' molto simile ad una fresa per spianare a parte la punta centrale. Taglia perfettamente e senza problemi di eccentricità, almeno sull'alluminio, producendo incredibilmente una serie di trucioli continui. Rispetto alla misura nominale il taglio è coerente (34,2mm su 34 nominali). A questo prezzo è veramente un ottimo acquisto. Oltretutto quella che mi è arrivata è costruita in EU al prezzo di un prodotto made in China.

Buenas

Mußte ein Loch in 2mm V2A bohren, war mit Schneidöl kein Problem.

Al recibirlo, se ve muy robusto con sus dientes... pero en el primer uso taladrando un cuadradillo de 50mm y 1.5mm de grosor se le callo un diente (usando un taladro bosch rct a muy bajas revoluciones). Lo de... se le callo un diente... lo expreso asi porque el diente no se partio, se desprendio de la corona... alomejor me vino una defectuosa... pero muy mala experiencia.

Muy mala calidad en huecos en Aluminio se ha roto