ShopBot recommends Onsrud tools If doing production work in a certain type of

Shopbot recommends onsrud tools if doing production

This preview shows page 7 - 12 out of 14 pages.

ShopBot recommends Onsrud tools. If doing production work in a certain type of material, it would be best to purchase a bit made for that type of cutting. If performing a number of different materials, then a more general bit could be used. Chip Load = per cutting edge. IPS = Inches Per Second. IPM = Inches Per Minute. RPM = Revolutions Per Minute. # of cutting edges = # of flutes.* *typically true unless stated otherwise by manufacturer. Chip Load = Feed Rate (IPM) / (RPM x # of cutting edges) Feed Rate (IPM) = RPM x # of cutting edges x Chip Load Speed (RPM) = Feed Rate (IPM) / (# of cutting edges x Chip Load)
Image of page 7

Subscribe to view the full document.

Selecting the Right Bit/Feeds and Speeds Charts • October 20, 2016 © Copyright 2016 ShopBot Tools, Inc. page 8 IPM = IPS x 60 Depth of cut: A function of cutting edge diameter set by manufacturer. Onsrud bits are typically allowed a cut depth per pass equal to the cutting edge diameter unless otherwise specified. For a deeper cut, it will be necessary to reduce the chip load. For twice the depth of cut, reduce the chip load per tooth by 25% and for triple the depth of cut, reduce the chip load by 50%. If doing this, it will be necessary to calculate the feed rate and speed instead of using the chart. Example using a 1/4” or 0.125” bit – Straight V Carbide Tipped Endmill SB# 13642: This bit is used for soft wood, at a depth of 1/2” (two times the diameter). The chart cannot be used for this calculation. Start with the middle of the range of recommended chip load provided on the chart ((.006+.004)/2=.005). Reduce that by 25% to allow for the deeper cutting depth (0.75x0.005=0.00375). Assuming that cutting will be performed at an RPM of 18,000 and that this tool only has one flute. Let’s use the ShopBot 3 “Chip Load Calculator” to decide what value to start with. Chip load calculator The “Chip Load Calculator” comes included in the ShopBot 3 software. It can be accessed by going to Tools > Chip Load Calculator (TL).
Image of page 8
Selecting the Right Bit/Feeds and Speeds Charts • October 20, 2016 © Copyright 2016 ShopBot Tools, Inc. page 9 In the previous example values were provided to cal- culate the feed rate. RPM: 18,000 Chip load: 0.00375, Depth of cut: 2 x Diameter = 1/2” Flutes: 1 Enter these into the calculator and click “Calculate.” This now provides the values needed to create an entry into the tool database in VCarve Pro. Diameter: 0.25” Pass depth: 0.5” Spindle speed: 18000 RPM Feed rate: 1.125 inches/sec
Image of page 9

Subscribe to view the full document.

Selecting the Right Bit/Feeds and Speeds Charts • October 20, 2016 © Copyright 2016 ShopBot Tools, Inc. page 10 The data is now available to input into the CAM software. The tool info sheet for VCarve Pro is shown.
Image of page 10
Selecting the Right Bit/Feeds and Speeds Charts • October 20, 2016 © Copyright 2016 ShopBot Tools, Inc. page 11 Feeds and speeds charts These charts have been taken from Onsrud’s recommendations and calculated in order to save time for the bits provided in the ShopBot bit kit. For further information, Onsrud series numbers are provid- ed. ShopBot numbers are also provided for an easier, streamlined ordering experience. Onsrud pro- vided numbers are cut depths, chip loads, and flutes. The exception to this rule is the “Carbide Tipped
Image of page 11

Subscribe to view the full document.

Image of page 12
  • Fall '19
  • Tools
  • Milling cutter, High speed steel, Surface feet per minute, End mill, Carbide Tipped

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes