Item Name
Replacement Graphite Reamer 20mm - 40mm
SKU
850-862
Description
This replacement reamer is constructed from graphite and is sized for shaping openings in the 20mm to 40mm range. In lampworking and scientific glassblowing, graphite is used because it tolerates heat well and releases cleanly from hot glass, making it ideal for truing, opening, and smoothing holes without sticking. A reamer in this size range is commonly used when you need to bring an opening to a consistent diameter, refine the inside edge, or clean up a hole after punching or blowing it out, especially when fit and symmetry matter for seals, connections, or clean finished rims.
How it is used
- Warm the graphite slightly near the work area so it is not ice cold against hot glass
- Bring the glass opening to a workable heat so it will move without collapsing
- Insert the reamer and rotate smoothly while applying light, even pressure to open and true the diameter
- Reheat as needed and repeat in short passes to maintain roundness and avoid over-thinning the wall
- Allow the graphite to cool between uses and keep it clean to prevent marking the glass
Dimensions
