PCD Step and Form Reamers: When to Use and What to RFQ
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.
This page decides when a step/form PCD reamer belongs versus split finish ops, and what RFQ fields to send. It is not a second reamer RFQ checklist for plain bores, not the step carbide vs PCD combination family essay, and not a wrong-choice reprint.
Drawing signals that need form/step
- Multiple related finish diameters on one axis
- Controlled chamfer/R between diameters
- Shoulder/face relationships that must not drift between tool changes
Product home: Custom PCD Reamer.
vs split ream + separate chamfer
Split ops win when features change often, chip space is tight, or one feature scrap mode must be diagnosed alone. One body wins when relationships and magazine time dominate—and chip/engagement still fit.
vs step carbide drill / combination family
If the job is mainly create multi-diameter, start with step carbide logic (step vs combo). If create+finish integration is the question, use the decision tree / combo product—not this finish-form sheet alone.
RFQ field sheet
Send for each step/form feature:
- Ø and tolerance
- Length / axial position
- Chamfer or R callout
- Coaxial / datum relationships
- Material, pre-hole/allowance notes, volume
Then use reamer RFQ checklist for shared machine/holder/coolant fields → Custom Cutting Tool RFQ.
Cost per Good Part realism
Count tool changes, relationship scrap, and reconditioning—not only the fancy body price. Cost per Accepted Hole.
Frequently Asked Questions
### Is every multi-diameter bore a step reamer?
No—create vs finish intent decides; see step-vs-combo and the decision tree.
Can we RFQ with only the largest Ø?
No—send each step Ø/length/R and relationships.
Same as combination drill-reamer?
Different job—combo integrates create+finish; this page is finish form/step.
What to send?
Step callouts + shared RFQ fields → RFQ.