• 3 inch pie cut marking sleeve with notches every 15 degrees round the rim
  • Pie cut marking sleeve fitted on stainless exhaust tube
  • Pie cut marking sleeves in 2, 2.5, 3 and 3.5 inch sizes
  • Side of a pie cut marking sleeve showing its reference slot and angled edges
  • Pie cut marking sleeve beside a finished pie cut bend
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Pie Cutting Pipe Guide Jig Sleeves - OD Tube

Pie Cutting Pipe Guide Jig Sleeves - OD Tube

£12.99
£12.99
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Size

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Pie cut marking sleeves for exhaust and fabrication tube

Slip-on sleeves for marking accurate, repeatable pie cut segments on tube from 1.5" to 6" OD. Both edges of the sleeve lean 7.5°, so scribing along each edge marks a complete slice, 20 mm at its narrowest, with 15° between its faces. Six slices make a 90° bend, and because every slice is identical, the sleeve also sets the bend radius (see the table below). Mark it, cut it, turn alternate segments and the bend closes up square with no wander.

Pie cuts are how you get a tight radius from straight material, or a bend in a size where mandrel bends are hard to find. They depend entirely on the accuracy of the marking, and that is the part these sleeves take care of.

Which version do I need?

This version is sized for OD tube: mandrel exhaust tube and other tube sold by its outside diameter. If you are working in schedule 10 stainless pipe, which is sized by nominal bore (NPS), you need the SCH10S version. A 1.5" NPS pipe is 48.3 mm OD, not 38.1 mm, so the two don't swap. Not sure which you have? Measure the outside diameter and check the table below.

How it works

  1. Draw two reference lines along the tube, 180° apart.
  2. Slide the sleeve on and hold it in place with its two slots on your reference lines. The slots sit on the sides of the angle, so the bend will form at 90° to them.
  3. Scribe along both edges. That's your first 20 mm slice.
  4. For the next slice, turn the sleeve 180° round the tube, butt its edge up to the line you just drew and scribe again. Repeat for as many segments as the bend needs.
  5. Cut on the lines, deburr, then turn every second segment 180° and tack them up.
  6. To take the bend into a different plane, use the notches set every 15° round the rim to move the cut round from one side to the other.

Specification

  • Cut angle: 7.5° per edge, 15° per slice
  • Slice: 20 mm at its narrowest point (the inside of the bend)
  • Bend radius: set by the sleeve: 76.4 mm plus half the tube OD (see table)
  • 90° bend: 6 slices
  • Reference slots: 2, set 180° apart on the sides
  • Adjustment notches: every 15° round the rim
  • Fit: slip-on. Hold it in place while you scribe, and take it off before cutting or tacking.
  • Material: plastic, with a hanging hole for storage
  • Made: to order in our UK workshop

Sizes

Size Tube OD Bend radius it gives (CLR)
1.5" 38.1 mm 95 mm (2.5D)
1.75" 44.45 mm 99 mm (2.2D)
2" 50.8 mm 102 mm (2D)
2.25" 57.15 mm 105 mm (1.8D)
2.5" 63.5 mm 108 mm (1.7D)
2.75" 69.85 mm 111 mm (1.6D)
3" 76.2 mm 114 mm (1.5D)
3.5" 88.9 mm 121 mm (1.4D)
4" 101.6 mm 127 mm (1.3D)
4.5" 114.3 mm 134 mm (1.2D)
5" 127 mm 140 mm (1.1D)
5.5" 139.7 mm 146 mm (1D)
6" 152.4 mm 153 mm (1D)

Radii are before saw kerf. Each 1 mm of blade width tightens the bend by about 4 mm.

Need a size that isn't listed? Get in touch and we'll quote it.

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