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DIHART ® Technical Data – Troubleshooting<br />
Problems • Possible Causes Solutions<br />
Bore too large<br />
• Run-out of the reamer in the spindle Use DAH ® compensating holder and reduce run-out<br />
• Alignment not precise, reamer cuts at the back end Correct alignment and use DPS floating<br />
holder<br />
• Built-up edge reduce cutting speed vc for uncoated carbide cutting material, increase for DST and<br />
coated cutting material or increase the coolant concentration<br />
• Reamer too big have the reamer reworked<br />
Bore too small<br />
• Worn reamer have the reamer readjusted, replaced or repaired<br />
• Stock allowance too small Increase stock allowance<br />
• Cutting forces too large reduce feed or choose a different cutting geometry (ASG)<br />
• Reamer too small have reamer readjusted, replaced or repaired<br />
Conical bore, tapered<br />
• Poor alignment Correct alignment and use DPS floating holder<br />
• Misalignment of head-stock in relation to turret correct turret and use DPS floating holder<br />
Conical bore, lipped<br />
• Poor alignment. Cutting edges press at start Correct alignment and use DPS floating holder<br />
Bore not straight<br />
• Run-out of reamer too large correct run-out using DAH ® compensation system<br />
• Poor alignment Correct alignment and use DPS floating holder<br />
• Asymmetric cutting through uneven entry surface Countersink bore<br />
• Deformation through clamping of the work piece Correct clamping of the work piece<br />
• Bore not premachined properly optimize premachining<br />
• Feed too high reduce feed<br />
Bore shows chatter marks<br />
• Cutting speed too high reduce cutting speed<br />
• L to D ratio too large reduce the entry speed, utilize a pilot bore or choose a different cutting<br />
geometry (ASG)<br />
Surface quality unsatisfactory<br />
• Cutting edge build-up reduce cutting speed v c<br />
for uncoated carbide cutting material, increase for<br />
DST and coated cutting material or increase the coolant concentration<br />
• Cutting edges worn have reamers repaired or replace tool<br />
• Run-out error of reamer correct run-out using DAH ® compensation system<br />
• Failing or insufficient coolant, chips getting jammed use internal coolant supply and increase<br />
coolant pressure<br />
• Unsuitable coolant increase the coolant concentration<br />
• Incorrect cutting data use data according to catalog recommendation<br />
Scoring in bore «feed marks»<br />
• Cutters worn replace reamer or have repaired<br />
• Cutting edge build-ups reduce cutting speed vc for uncoated carbide cutting material, and<br />
increase for DST and coated cutting material or increase the coolant concentration<br />
Scoring in bore «retraction marks»<br />
• Reamer is allowed to travel too far out of the bore Only allow the reamer to travel out of the bore<br />
2 mm more than the cutting length at the most<br />
• Material springs back do not rapid retract, rather feed (2-3 times) out<br />
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