IndexableChamfer tool

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High-Speed Steel (HSS) is a popular material good for drilling into soft steels as well as wood and plastic. It’s an economical solution for most maintenance drilling applications.

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So I dug into how to get Fusion360 to make back (backside, bottom chamfering, etc.) chamfers. And unfortunately, it’s not simple or straight forward. And in all honesty, the information seems to be stagnant out there. The best resource for Fusion 360 I’ve found has been NYC CNC, great guys and very informative content. They have a great, although dated, video ( https://youtu.be/HsBR2_6h4mM ) of how they have tackled the problem of back side chamfering if you want to see where I am starting from.

Front and backchamfer tool

If you will be drilling a few holes in soft/hard woods then don't worry too much about the bit material. If someone has shown you that they drill nice clean holes then go for it. If you are planning to drill thousands of holes in wood, MDF or plastics (plastics tend to generate more heat when drilling) then go for HSS (or if you're planning on living for a long time without buying more drill bits). You certainly don't need two sets of the same drill sizes in different steels.

AS already mentioned above, HSS should be a better material for making drill bits out of because it should be harder. I have owned bits with HSS stamped on them that were definitely not great bits.

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Whatever tool you’re using you need to bring it into Fusion360. Iscar makes it very easy as they have files package for every tool. If your tool of choice doesn’t have a 2D file, you can always draw it from scratch using provided dimensions. You can also setup a parametric template to use in the future if you’re so inclined.

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Bestbackside chamfer tool

BacksideCountersinktool

However, they have nothing to say about Cr-V, so I don't know if Cr-V, while apparently a popular material for wood-boring bits, is considered a more or a less economical choice, and whether it's better suited for wood drilling than HSS

This is where this method really shines, when we use our new form tool and create a 2D contour or Trace or pocket for chamfering we don’t need to apply any hacky work arounds in the “stock to leave” box or play with the contour height selection, or even need to make a template tool path, it just works! Select the 2D or 3D contour that requires a chamfer and you’re good.

First challenge is finding a backside chamfering tool which fits your part and has adequate reach. I am using Iscar’s MultiMaster upper and bottom chamfering tools (MM HDF100-090-2T05). You can use whatever tool you want, but check the following:

Insertchamfer tool

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I need to purchase a set of brad point bits (all I own are split point). I see some that are High Speed Steel (HSS) and others made of Chrome Vanadium (Cr-V), and I'm not sure how much the steel should factor into my purchasing decision.

Recently I found myself with the issue of needing to chamfer a part feature, but I couldn’t reach it with the traditional chamfering approach.

You are comparing "apples to oranges". They are dramatically different ; HSS will cut steel while red hot ( in a dark room , 1100 F), and contains roughly 20 % alloys. Cr , V is a low alloy tool steel ( like grade L-2) and contains less than 3 % alloys . The V carbides will hold an edge longer than other low alloy tool steels , but not to a degree that a craftsman could notice. An indirect comparison is that HSS is hardened by oil quenching from about 2200 F and tempered at about 1100 F. Cr, V is hardened by quenching from 1600 F into oil and tempering at about 350 F ; I understand this info is no value to the user but it indicates these are significantly different alloys. If you are drilling wood , the Cr, V are fine . I you want to drill more than a couple holes in steel ,pay for the HSS.

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MillChamfer Tool

Backside chamfer toolfor sale

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Just for clarity I will be using the ASME Y14.5 standard (section 1.8.16) for chamfer dimensioning. That is, where the called out dimension is the opposite or adjacent side of a triangular chamfer, and not the hypotenuse.

I did find this handy description but it focuses on drilling in metals, not wood, and is, therefore, off topic here. I'm sure some of it translates to wood working, but I'm not sure exactly how. At this link, they state:

45 degree BackChamfer tool

I know it's not just a matter of "cheap ones are HSS and expensive ones are Cr-V" (or vice-versa) - I see that a highly rated brand has individuals and sets in both materials and the prices are similar for similar sized bits.

When we create the form tool we select the tool profile we created, select the axis of rotation (arrow points down), and most importantly select the compensation point we just created. And that’s it! The new form tool is in your tool library.

For brad point bits, the design and quality of production process are more important than the material when it comes to the quality of the hole. The quality of the material (given the same design) would contribute to the lifespan between sharpenings. Lifespan can also be dictated by the material you drill and the number of holes you drill(obviously).

On the same plane, create a new sketch and draw out HALF of the tool’s profile with the sketch origin being on the tool’s centerline.

Lathe Feed. • Distance cutting tool advances along length of work for every ... Machine steel010–.020 0.25–0.5 .003–.010 0.07–0.25. Tool steel .010–.020 ...

Now here is the clever bit, to get Fusion to recognize the tool as a back chamfer tool we need to define the tool compensation point. Normally, this point is the revolves centerline at the lowest Z height. But we don’t want that so we need to tell Fusion where we want to compensate the tool point.

Some caveats however, if your tool diameter is very close to the minimum cutting radius be sure to use feed optimization option. If your tool diameter is also close to the minimum cutting radius, avoid steep Z height changes along 3D contours. You get a “step” in the tool path and may cause gouging. Additionally, if the solid model has the chamfers modeled in, you’ll need to create another form tool with the compensation point at the lower cutting edge.

... H8 H11 G7 F7 F8 E8 E9 D10 deviations in µm. 1. 3. -18. -14. -10. -6. -6. -4. -4 ... ISO Shaft Tolerance Chart. For shaft tolerance system, Nominal sizes from 1 ...