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Rockwell Testing again requires application of various loads to a variety of indenters to achieve again a reading of resistance to penetration through depth measurement. The Rockwell test is simpler to run and requires less sample preparation and minimal damage to finish parts. The Rockwell testing machine calculates the penetration and gives the unique hardness number. This number also has no units.

Surely Richard Kopp would not mind. Here is a link to my google drive with the file. Makita Feed & Speed Calculator by Richard Kopp

Rockwellhardnessscale

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If you join the Onefinity CNC Users Group on Facebook, A user Richard Kopp uploaded an excel sheet for Makita Feed & Speed Calculator. Hopefully that will help some.

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Mild steelhardnessRockwell C

I am looking for a comprehensive guide on how to set my Spindle speed, Feed Rate and Plunge rate for various materials - or as a rule of thumb, how these figures vary between MDF, Softwoods and Hardwoods.

60 HRChardnessmaterial

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Feb 26, 2022 — As I mention in my Comment above, there are no clear reasons to prefer one type over the other for varied materials, except possibly whether ...

Kyle make sure you watch all the video, it is only 5 minutes long but it is full of all the info you will need to set up your tool database and personalize it. (speeds and feeds on about 4minutes in)

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I did forget i did this. I did not use this for speeds and feeds but i did load it into my v carve for tool dimensions for whiteside bits https://www.whitesiderouterbits.com/ gave me a starting point for bitsbits downloads section

This might be helpful - and hopefully not too against the grain - but Carbide 3D (Winston Moy) did a series for cutting different materials for their machines (Shapeoko and Nomad). Its still a good starting point for those new.

Brinell Testing is a fairly simple test but the most destructive type. It requires more sample preparation and can at times require destruction of a finished part. A defined load of 500-kg to 3000-kg is applied through a 10 mm hardened steel ball indenter and the subsequent impression is measured. A Brinell number is then assigned to that measurement. Brinell numbers are unique to the process and do not have units assigned.

I started to build out a reference table, mostly for my Nomad, but didn’t do anything on the Shapeoko, but might go back and do that, as it’ll cross over to the 1F easily. It’s a whole playlist, so be sure to check other videos in the series. 12 & 13 are good starting points too.

Hardness of steelschart

Here’s an article that I think might be of interest to many of you. I think it does a good job of explaining the concepts. I don’t have any connection or financial interest in the company making the post, but I subscribe to his email list because I have found many of his posts interesting.

Would love to see the feed and speed calculator however I do not have a Facebook account. Is this available as a different link not on Facebook?

It is possible to convert hardness to Tensile Strength and this is shown in the chart. It is best used on hardened steel products as accuracy is better. This same conversion cannot be used for Yield Strength. Tensile Strength is shown in KSI which stands for 1000 pounds per square inch (psi). Also shown is the metric version of strength which is in MPa (Mega Pascal) or N/mm2 (Newton per millimeter squared)

Hardness testing can best be described as a measurement of “resistance to penetration” to a defined load. Several types or methods of hardness testing are more common and found in this table.

HRChardnessfull form

Hey Kyle - 40-60ipm is reasonable and safe for most hobbyist machines. I’ve pushed mine to 100 so far without any problems. 176 is pretty fast - well outside the speeds capable by the X-Carve, but OF is capable of doing it. I don’t know what the upper limit for speeds. I hope to do some testing and post a video - maybe I’ll target Richard’s numbers to validate (not that I don’t believe them - I just like some comfort that my machine is capable).

Feeds and Speeds: The Definitive Guide (Updated for 2022) If you're serious about CNC, you NEED to optimize your Feeds and Speeds. Why? Because feeds and

I think what I am battling to grasp is what would be considered a fast Feed Rate on the Onefinity. I’ve seen videos where they refer to 40-50 ipm as a conservative speed - so that is what I planned on using. However, when going through Richard Kopps Makita Calculator , I see that his examples referring to an 1/8 inch 2 flute End Mill - He suggests 12k RPM at 132 ipm or 16k RPM at 176ipm (For Ply or MDF), in order to obtain the correct Chip load for that bit .

It can occur due to several reasons like the edge of the board being subjected to moisture, temperature changes, or mechanical stress.

I don’t have many bits at the moment, but while playing with the ones I do have, I tried moving from MDF to Hardwood pieces but am unsure how to adjust my speeds and feeds.

Thanks Paul. Whereabout on the site, if you don’t mind me asking? I can find the Tool Poster and the catalogue, but nothing about Feeds and Speeds.

Harder materials require heavier loads and harder indenters. Tungsten Carbide indenters for Brinell and diamond indenters for Rockwell are used. Small loads are used for thinner materials making Rockwell A and N and T type hardness more reliable for sheet and tube. They are also better suited to softer materials like Aluminum as well.