Clipper blades heat up while clipping from friction as the blades are moving. Clipper blade sharpening has no real effect on how hot your clipper blades get but there are a few things you can do to reduce how hot your clipper blades get: 1) Oil your clipper blades (teeth, back & slide). 2) Use the clipper at a lower speed. 3) Reduce blade tension (horse clippers). 4) Swap to a spare set of clipper blades. 5) Fit a ceramic part in your clipper blade (A5 blades). 6) Accept that some heat is normal. 1) Oil Your Clipper Blades There are 2 types of oil, liquid clipper oil and spray clipper oil. Oil should be applied in three places; to the front at the teeth, to the back edge of the moving blade and also to the slide on top of the cutter blade (if there is one). - Spray clipper oil is cold when you spray it from the can which does cool the blades. - Liquid oil is a better lubricant than spray oil as spray oil is very thin. - Be careful not to get spray oil into horse clipper main head bearings as spray oil will dissolve the grease in bearings. 2) Use Clipper at a Lower Speed The faster the blades are moving then the hotter they get. If you use a slower clipper, or use a lower power setting then the blades will not heat up as much. 3) Reduce Blade Tension Horse clippers have a tension screw to adjust the blade tension and lighter tension will produce less heat. On clipper blades with no tension screw you can reduce tension by adjusting the spring. However as the blades wont cut with light tension its usually best to leave this alone. 4) Swap Your Clipper Blades Most Professional groomers have multiple sets of clipper blades and if one set gets too hot they swap blades to let them cool. 5) Fit a Ceramic Clipper Blade Ceramic clipper blades have one part of the blade which is ceramic rather than metal. Ceramic does not heat up as much as metal, so the clipper blade runs cooler. Currently only normal width A5 blades and a few hair clipper blades have a ceramic part available. We can fit a ceramic part to any normal width A5 blade for £2 extra during sharpening. See Ceramic Clipper Blade Sharpening. 6) Accept That Some Heat is Normal While it may not be what you'd like, normally the blades dont actually heat up that much. - The blades do loose heat as you run them through the the hair and normally don't too hot to use. - However if the blades do get very hot they could burn the skin or melt any plastic parts, so do be sensible and if necessary stop clipping to let your blade cool down and re-oil them.