ALL ABOUT

CUTTER

BUSHINGS

Cutter bushing length

CAUTION: Blade hazard

In order to comply with OSHA regulations, the distance from the sidewall of the cutter to the blade (through the bushing) must be long enough to prevent fingers from reaching the blade.

On flexible extrudates, it is important to minimize the length of the cutter bushings. It is very difficult to push flexible extrudates through since it tends to compress as it is pushed, causing a marginal increase in the tube diameter. For this rea- son, bushing lubrication may be necessary to minimize drag as the length of the bushings increase. A discharge conveyor may also be helpful in removing longer cut parts. The exit bushing may be funneled to allow the cut part to drop out faster while still maintaining minimal bushing length for safety.

For flexibles, the upstream cutter bushing should offer total support to the extrudate as close to the nip point

of the puller as possible. In this way the part is not able to move from side to side or bow from the weight of the tube, which can, in turn, cause variable drag. You use the strength of the tube to push itself.

The bore length of the exit bushing should not be shorter than 1 1\2 times the diameter of the tube with the remain- der of the bushing length being tapered. On sticky flexible extrudates, the parts will actually stick back together if the new part has to push the cut part out very far.

For rigid extrudates, the length of the cutter bushings can result in a square cut or an angular cut. The cutter bushings support the extrudate keeping it from moving from side to side and bowing from the weight of the profile itself. Many proces- sors make their bushings short to minimize cost of EDM which is determined by depth of cut.

For rigid extrudates, a general rule is to make the length of the cutting bushings equal to two times the largest out- side dimension. NOTE: In the case of full profile cutter bushings where maximum support is offered, the bushing length may be shortened depending on actual clearance.

Be sure to have a lead-in angle machined into the entrance of the upstream cutter bushing. The transition from the bore to the lead-in angle should not be abrupt as it to can cause variable drag.

C-4 APPENDIX

ALL ABOUT CUTTER BUSHINGS

UGE059/1003

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Conair SC-5 manual Cutter bushing length

SC-5 specifications

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