MDD Modular Deep Hole Drill Bits

Source the MDD Modular Deep Hole Drill Bits from RONGKE, a manufacturer in China, with order details focused on the adjustment interval of the selected modular head. The MDD drill is distinguished by adjustable outer cutting cartridges and a central pilot with a specified projection setting. The catalog describes 0–5 mm diameter adjustment within a selected head group, so buyers can configure the diameter interval and modular reach together.

Key Facts at a Glance

Component Roles

MDD combines a pilot with inner cutting inserts and adjustable outer cartridges. The head group's stated 0–5 mm adjustment is a diameter setting range, not permission to fit cartridges from an unrelated group.

Where This Configuration Fits

Choose the MDD Modular Deep Hole Drill Bits when the job calls for the adjustment interval of the selected modular head. MDD is intended for large-hole applications where the listed diameter interval, adjustable cartridges and pilot arrangement fit the feature. The modular head and reach components must be selected as a matched assembly.

Selection guide — MDD vs Phoenix combined: MDD expressly lists diameter adjustment and a pilot-projection setting. W/Z Phoenix heads are selected from their own head/body combinations; the MDD adjustment claim must not be transferred to them.

Four Configuration Decisions

1. Choose the MDD adjustment interval

Select the actual diameter interval in the MDD table. The catalog describes 0–5 mm diameter adjustment; the unusually wider last row needs confirmation before use.

2. Set the pilot projection

Match the HPD pilot code and use the projection table for the drilling diameter and depth class. Pilot length alone does not define its projection beyond the head.

3. Identify inner and outer insert cartridges

Record VNC and VMC references separately. The catalog gives a WC insert size for each body interval; the cartridge and insert are different order items.

4. Complete the modular connection

Match the head to the YXZ extension or DXZ connecting shank by interface. Review diameter adjustment, pilot setting and coolant continuity on the assembled tool.

Order Verification

Production & inspection

Use MDD diameter setting, pilot projection, cartridge seating and adjustment-lock condition as the inspection focus. Ask for the measurement method and acceptance limits to be stated in the quotation if a dimensional report is required.

Replacement Order Details

Use the adjustment interval of the selected modular head to define a replacement enquiry for the MDD Modular Deep Hole Drill Bits. Confirm item quantities with RONGKE before accepting the supplier factory quotation.

FAQ

1. Q: Is the entire MDD range adjustable with one head?

A: No. Select a diameter interval and adjust within its confirmed range. The catalog states 0–5 mm adjustment.

2. Q: How should the center pilot protrusion be selected?

A: Use the pilot-projection table on PDF p.62 for the actual diameter and depth class, not the pilot’s total length.

3. Q: Are the cartridge and the WC cutting insert the same component?

A: No. VMC/VNC identify the outer/inner cartridges; the WC size identifies the cutting insert fitted to them.

4. Q: Can any MDD extension be used on any head size?

A: No. The modular locating diameters and applicable head group must match.