How to replace router bits sears Craftsman router?
To replace router bits on your Craftsman 31517400 double insulated router, unplug the tool, loosen the collet nut, remove the old bit, then insert the new bit correctly and tighten the collet securely. This prevents bit slip, chatter, and unsafe operation.
- Unplug the router (or remove the battery if applicable).
- If your router has a spindle lock, press and hold it.
- Use the correct wrench to turn the collet nut counterclockwise to loosen.
- Pull the old bit straight out.
- Insert the new bit shank fully, then back it out about 1/16 to 1/8 inch so it is not bottomed out.
- Tighten the collet nut clockwise until the bit is firmly clamped.
- Confirm the bit shank size matches the collet (commonly 1/4 inch or 1/2 inch).
- Make sure the bit is straight and fully seated (not cocked).
- Verify the collet nut is tight; a loose collet can let the bit walk out.
- Spin the bit by hand to ensure it clears the base opening.
| Symptom | Likely cause | What to do |
|---|---|---|
| Bit slips during a cut | Bit bottomed out or collet not tight | Reinsert with slight back-out; retighten |
| Excess vibration | Bent bit, dirty collet, or wrong shank size | Clean collet; use correct shank; replace bit |
| Collet feels stuck | Resin or sawdust buildup | Clean collet and nut; inspect for damage |
A router bit spins at very high RPM. Proper collet clamping and correct bit insertion depth help prevent kickback, burning, rough edges, and damage to the collet, motor shaft, or workpiece.
For safe electrical troubleshooting if your router will not start after a bit change, use how to use a multimeter to test electrical parts video.
Last updated: February 2026
What is a Sears Craftsman router?
A Sears Craftsman router (like the Craftsman model 31517400) is a handheld, corded woodworking power tool that spins a cutting bit at high speed to shape edges, cut grooves (dados), and make precise joinery. This model is a double insulated router, so it’s designed to run without a separate grounding wire.
Routers are used for both rough material removal and fine finishing work. Common tasks include:
- Rounding over, chamfering, and profiling edges
- Cutting rabbets and dados for shelves and panels
- Trimming laminate or veneer flush to an edge
- Cutting hinge mortises and other shallow recesses
- Making repeatable cuts with a straightedge or template guide
Because we do not have model-specific documentation for 31517400 here, we focus on what’s standard for a Craftsman double insulated router:
| Feature | What it means | Why you care |
|---|---|---|
| Double insulated housing | Extra internal insulation instead of a ground wire | Helps reduce shock risk when used correctly |
| Variable depth adjustment | Sets how deep the bit cuts | Controls accuracy and prevents over-cutting |
| Collet and nut | Clamps the router bit shank | A worn collet can cause bit slip or vibration |
| Base and sub-base | Supports the router on the work surface | A stable base improves cut quality |
Unplug the router before changing bits or making adjustments.
- Use sharp, undamaged router bits; dull bits burn wood and strain the motor
- Tighten the collet firmly; insert the bit shank fully, then back it out slightly before tightening
- Make multiple shallow passes instead of one deep pass
- Secure the workpiece with clamps; never hold small pieces by hand
- Wear eye and hearing protection; use dust collection when possible
Using the right router technique protects the motor, improves cut quality, and reduces kickback risk. Most “router problems” come from bit issues, incorrect depth settings, or unstable workholding, not the motor itself.
For general repair and troubleshooting skills that apply to corded tools, we recommend how to use a multimeter to test electrical parts video.
Last updated: February 2026
Does Craftsman make a router table?
Yes. Craftsman has made router tables and router-table accessories that can be used with many Craftsman routers, including models like the Craftsman 31517400 (double insulated router). The key is matching the table’s mounting plate and the router’s base-hole pattern so the router mounts securely and stays aligned.
A router table is only a good fit if the router mounts correctly and the bit height can be adjusted safely.
- Confirm the router table includes a mounting plate (or insert plate) that supports your router’s bolt pattern
- Check the maximum bit opening and whether it accepts guide bushings (if you use templates)
- Look for a flat, rigid tabletop and a fence that locks square
- Verify dust collection options (fence port and/or cabinet port)
- Make sure the switch is easy to reach (paddle-style is common)
Because router tables are often universal, compatibility usually comes down to the plate and clearance.
| Item to match | What “compatible” means | Why it matters |
|---|---|---|
| Mounting plate | Pre-drilled for Craftsman patterns or drillable | Prevents vibration and misalignment |
| Base opening | Large enough for your bits | Avoids rubbing and unsafe contact |
| Adjustment access | Above-table adjustment supported (if needed) | Faster, safer bit-height changes |
| Fence | Straight, adjustable, locks firmly | Cleaner cuts and repeatability |
A properly matched router table improves control for edge profiles, dados, and joinery; a poor fit can cause chatter, inaccurate cuts, and unsafe handling. For a double insulated router like the Craftsman 31517400, stable mounting and good dust control also help keep the motor cooler and the work area clearer.
If you are shopping by model number or trying to confirm what fits your setup, use how to find your appliance model number (and what it means for parts) to make sure you are referencing the exact Craftsman 31517400 identification when searching.
Last updated: February 2026
