"Set-on" type Size on Size Holes have gaps in the gutter

"Set-on" type Size on Size Holes have gaps in the gutter

There are two types of "size on size" fittings. "Set On" and "Inner Edge Fit".   When cutting holes with diameters that are nearly the diameter of the pipe, you should limit the negative bevel so that the torch does not overburn through the gutter of the hole.  You can set the default negative bevel limit for holes in Settings-->Default Cut Values-->Hole-->Negative Bevel Limit.

Size on Size--Set On
This more common type of size on size fitting is where the hole is the size of the inner diameter of the set-on pipe. Here are the settings for this type of fitting.
Set-on Hole

Preview

Set on Sadde



Size On Size--inner edge fit
This type of size on size fits the inner edge of the hole to the inner edge of the saddle.   Please the PypeServer training video "Size on Size Saddles and Holes".
To cut a size on size saddle and hole:
  1. Check the Size on Size checkbox for both hole and saddle
  2. To create a bevel in the gutter of the hole where the toe of the saddle sets, set each cut with half of the desired bevel.  For example, for a 30 degree bevel, set both hole and saddle bevels to 15 degrees.  Note that a torch with a 45 degree bevel limit will cut a flush-fit where the high-point of the hole connects with the heel of the saddle.   If your torch cuts less than 45 degrees, you can wither grind the remaining metal to get a flush fit, or you can check the "No Grind" feature to move the torch to the outer edge when the torch limits.  This will reduce grinding, but will result in an undercut.  The "No Grind" feature for saddles is only available when the Size on Size cut feature is checked.
To get a good fit for these cuts the machine must be accurately tuned, and you must give accurate actual dimensions of the pipe (outer diameter and wall thickness).
  1. Torch should be center over the pipe
  2. If your torch head spins (such as about an A axis), then the torch must not spin out of round.  In some cases, PypeServer can factor that out if it's off.
  3. Torch should be able to bevel 45 degrees so as to make the tops of the hole and the heels of the saddle fit.
  4. Pivot height set right
  5. Kerf correct
  6. Torch beam divergence set correctly
  7. Feedrates correct so you don't overburn.


    • Related Articles

    • No Grind feature for miters, some holes and saddles

      No Grind feature for miters, some holes and saddles and Size-on-Size Holes and Saddles. There are times when the torch cannot cut the exact cut desired because of bevel limitations. These limits are hit in these cases: When a torch is fixed at one ...

    • Importing PCF files

      Importing PCF files Using PCF Files from CAD to PypeServer This document explains the meaning of data in a PCF file and how to structure it to get the best flow of data from your CAD system/workflow into PypeServer. Contents 1 Configuring your CAD ...

    • Lone Star Revolver with a NUM Controller

      Lone Star Revolver with a NUM Controller PypeServer for the Lone Star Revolver with a NUM Controller This document covers topics specific to PypeServer output for Lone Star Revolvers with chucks, running NUM controllers. Topics in this document: ...

    • Lone Star Magnum with NUM Controller

      Lone Star Magnum with NUM Controller PypeServer for the Lone Star Magnum with a NUM Controller This document covers topics specific to PypeServer output for Lone Star machines running NUM controllers. Topics in this document: PypeServer settings for ...

    • Enterprise Training - Part Design

      Designing Parts Introduction to designing parts V2 overvew of part design v2.02 7 Using the Cut Tree Viewer How to use the cut tree viewer control Demonstrates the use of the Cut Tree Viewer control in the Designer tab. Shows how to add more columns, ...