Understand on the niche product .... but I'm used to the £1.49 regular drills from Screwfix - or the odd special drill from Bosch at about a fiver!Niche* / Quality / Cheap
Pick 2 of 3.
* length in this case
Also impressed you need to remortgage for 3x £12-26
You should have gone a bit upmarket and bought Silverline. Serve you right.I bought a long set for drilling out ‘wands’ on the lathe (for putting an LED in the end like Harry Potter wands), thet were the Toolzone 300 mm set of 7 for ~£10 (set number DR134, which came in a plastic case.
They were carp; the 4 and 5 mm were significantly curved out the box, and flexed significantly at the slightest pressure. I’ve not tried the rest.
Even using the ‘drill the centre, then mount through the centre and do the outside’ they still made curved holes.
Examination of a 'conventional' twist drill, especially a broken one,will reveal that the web in the middle is quite thin. That is where the flexing occurrs. For example a 6mm twist drill is significantly more flexible than a 6mm flat/spade/quick bit. I have not seen a smaller diameter flat bit. Most of the drift away from the centre of the hole is caused by pushing. Exactly the same as a jigsaw blade. Letting the drill cut at its own speed will give better results, otherwise the bit will take the easiest path, which may not be a straight line.I also want long bits, so I can make slide whistles on my lathe, out of oak from a tree in my garden. I want to end up with a 12mm hole but presume I need to increase the diameter in stages. The problem is that all the long bits I've see have deep flutes, which I would have thought are likely to let the hole wander, going a long way into end grain. I watched a video about making a clarinet, obviously far more precise than I need to be and they used a reamer to true the hole. Does anyone have any experience and advice about boring a smooth deep hole (200mm), reasonably true, on the lathe?