What a step or form PCD reamer RFQ needs

Prints that stack diameters, chamfers, and radii on one bore often get quoted as “a reamer”—then the missing step lengths show up as a revision loop.

Below are the callouts to send for each diameter, length, chamfer or radius transition, and datum relationship, so the drawing can be quoted without back-and-forth.

Illustration: Multi-step bore with PCD step/form reamer

Features that make it a step or form RFQ

  • Multiple related finish diameters on one axis
  • Controlled chamfer/R between diameters
  • Shoulder/face relationships that must not drift between tool changes

Step body or split ops?

If you haven't yet decided between one step body and split reaming plus a separate chamfer op, start with step reamer vs separate ops or combination tool. The fields below assume the step body is the plan.

RFQ field sheet

For each step or form feature, send:

  • Ø and tolerance at each step
  • Length / axial position from one stated datum
  • Chamfer or R callout at each transition
  • Hole type per step: through, blind, or cross-drilled
  • Coaxial / datum relationships, and how you check them today
  • Material, pre-hole/allowance notes, volume, and the current failure mode

Add the shared machine, holder, and coolant fields from the reamer RFQ checklist, then send the drawing through the Custom Cutting Tool RFQ.

Illustration: Step diameter and length RFQ pack with tool

Cost per accepted hole

Along with the tool price, count tool changes, scrap when step relationships drift, and reconditioning; see cost per accepted hole, PCD vs carbide.

Frequently Asked Questions

Can we RFQ with only the largest Ø?

No. Send the Ø, length, and R of each step, plus how the steps relate to each other.

Do chamfer and radius transitions need their own callouts?

Yes. Give each chamfer or R size and its position along the bore, so the transition can be ground to the drawing.

What drawing data do you need to quote a step or form PCD reamer?

For each step or form feature: Ø, tolerance, length, and chamfer/R. Also hole type, pre-hole notes, datum relationships, material, volume, and the current failure mode. Send these with the drawing through the RFQ.

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