![]() ![]() Presto recommend a pilot drill with a diameter one and a half times the chisel edge of the next size. You will end up with lots of drills which need re-sharpening. A small cut can chip off the corners of the drill and can also pull the drill into the work. Going up in 2mm steps is not a good idea, the pilot hole should be just a bit larger than the web of the large drill. A large diameter drill needs a faster feed per rev than a small drill. P.S I'm only a beginner so I am sure someone will be along to advise you better. I watched Blondiehacks (youtube) drilling deep holes, & do as she said which was to go steady & back out often to clear the flutes. ![]() The work does some weird things with temperature. If that happens I do & would stop until the work cools down. Which by the way I have been doing on some 316 today. One problem I was warned about & have noticed to be true is that once you start increasing the size of the hole. The flute sides are not worn, plenty of lubrication, The bit is sharpened correctly. ![]() I think a lot of it is, a good quality drill. I had to take both hands to the tailstock wheel to keep the pressure up and make the tool cut, but that isn't a problem.ĭid I just luck out somehow? Obviously I'll be doing it this way henceforth because it seems to work, but I'd like to understand what's going on. It just went straight through 40mm deep without any complaint. It's been a pain and I couldn't understand what I was doing wrong.įed up with all this, tonight I pre-clenched my buttocks and attacked directly with a 17mm bit, the biggest I have. I've been doing that and it hasn't worked well - invariably, somewhere above 12mm, the bit snags and something gives way - the work in the lathe chuck, the bit in the drill chuck or the taper in the tailstock. There are lots of questions about drilling holes of this sort of size in steel on the internet, and the advice is invariably that one should start small (say 8mm) and open up maybe 2mm at a time. Weld build-up of worn parts can also be dressed to their original size again, representing a substantial cost and time saving by minimising parts wear and breakage.I've been doing a bit of boring on the lathe recently, and I need to drill at least 16mm through the work to allow my 'normal' boring tool to start. Most shafting bushings and bearing housings can be remade or repaired, with a press available on-site to install them.Ī wide range of general fitting tasks can also be undertaken, such as bull-nose milling, ramping work, and slotting stock for guideways. Most types of gear teeth can be reproduced in the workshop, along with appropriate hardening via heat treatment on the premises. With in-house tool making available, special HSS (High-Speed Steel) cutting tools can also be made on request. This grinder is semi-automatic, ensuring high accuracy and repeatability between workpieces.Ī wide range of sharpening surfaces is also offered, including tungsten-tipped tooling. Drill bits up to 50mm can be sharpened, and bulk lots of drill bits can be sharpened at an affordable rate. The workpiece on the Jones and Shipman is typically held with a magnetic surface chuck preferred for the non-distortion of delicate parts during the machining. These machines include a Jones and Shipman 540 hydraulic surface grinder, capable ofĭynamically grinding flat surfaces, which is particularly helpful in making special tooling for subsequent production. Four other specialised machines handle tasks such as cutting bulk stock to length, sharpening tool bits and drills, and surface grinding of technical components. These can be tackled productively with the right choice of tooling.Īs well as the capabilities of the milling and lathe machines, surface grinding in specialist machinery is also offered. Modern automotive finishes for heads can be demanding in terms of desired surface finish. Fly cutting or surface dressing is available and boring to detailed tolerances and specified surface finishes.Ī fly cutter is a specialised tool for surface finishing large surface areas, such as automotive heads and block castings, with a width of up to 285mm. It is possible to execute a circular pattern of holes in any workpiece precisely with repeatability. A large rotary table is used in conjunction with dividing head accessories, making this especially usable for refurbishing some automotive components or fitting non-standard parts. The heavy-duty turret mill is basically a sophisticated drill that can drill precise, complex hole patterns using the DRO (Digitial Read Out) on the mill. ![]()
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