National Spline Drive Inverted Spotfacers and Pilots

cutters        pilots




inverted spotfacer assembly

National Spline-Drive Inverted Spotfacers combine Ruggedness, Positive Driving and Accurate Alignment with long life and easy assembly. Hardened and Ground Alloy Steel Pilots fit snugly in the cutters, while driving is accomplished through splines that are part of the pilot. These splines bear against slots in the cutter, giving an equalized drive with all the advantages of the ordinary spline shaft drive.

The cutter is retained by solid shoulders on the pilot, yet removal of the cutter is very easy. All that is necessary is to turn the cutter backwards on the pilot a small distance, then slide it off. Pilots have a spiral oil groove to facilitate proper lubrication.

 

 



inverted spotfacter cutter   spotfacer dimensions sketch

Spline Drive Inverted Spotfacer Cutters

High Speed Steel

 Part No. Diameter
of cutter
Length
of cutter

Diameter of
pilot hole

National drive
 

 A

 B

 C
 
 
 NAT.51107  1/2"  5/8"  5/16"  312
 NAT.51108  9/16"  5/8"  5/16"  312
 NAT.51109 discontinued  5/8"  5/8"  5/16"  312
 NAT.51110 discontinued  11/16"  5/8"  5/16"  312
         
 NAT.51111 discontinued  3/4"  3/4"  3/8"  375
 NAT.51112 discontinued  13/16"  3/4"  3/8"  375
 NAT.51113 discontinued  7/8"  3/4"  3/8"  375
 NAT.51114  15/16"  3/4"  3/8"  375
         
 NAT.51115 discontinued  1"  7/8"  1/2"  500
NAT.51117 discontinued   1-1/8"  7/8"  1/2"  500
 NAT.51119 discontinued  1-1/4"  7/8"  1/2"  500
         
NAT.51121 discontinued  1-3/8"  15/16"  5/8"  625
 NAT.51123 discontinued  1-1/2"  15/16"  5/8"  625
         
 NAT.51125 discontinued  1-5/8"  1"  3/4"  750
 NAT.51127 discontinued  1-3/4"  1"  3/4"  750
 NAT.51129 discontinued  1-7/8"  1"  3/4"  750
 
 NAT.51131 discontinued  2  1-1/4"  1"  1000
 NAT.51133  2-1/8"  1-1/4"  1"  1000
 NAT.51135 discontinued  2-1/4"  1-1/4"  1"  1000
 NAT.51137 discontinued  2-3/8"  1-1/4"  1"  1000
         
 NAT.51139 discontinued  2-1/2"  1-1/4"  1"  1000
 NAT.51141 discontinued  2-5/8"  1-1/4"  1"  1000
 NAT.51143 discontinued  2-3/4"  1-1/4"  1"  1000
 NAT.51145 discontinued  2-7/8"  1-1/4"  1"  1000

 

pilot dimensions sketch

Inverted Spotfacter Pilots Spline Drive
Taper Shank  Straight Shank  Diameter of Body  Diameter of Cutter Arbour  National Drive  Range of Cutters  Morse Taper  Length of Shank ( for straight shanks) Diamers of Shanks ( for straight shanks) 
   

 G

 C

 D
 

 E

 H

 J
   NAT.51301 discontinued  5/16"  5/16"  312 1/2" to 11/16" Diameter    2" 1/2"
   NAT.51302  3/8"  5/16"  312    2" 1/2"
   NAT.51303 discontinued  7/16"  5/16"  312    2" 1/2"
                 
  NAT.51305 discontinued  3/8"  3/8"  375 3/4" to 15/16" diameter    2"  5/8"
  NAT.51306 discontinued  7/16"  3/8"  375    2"  5/8"
  NAT.51307 discontinued  1/2"  3/8"  375    2"  5/8"
  NAT.51308 discontinued  9/16"  3/8"  375    2"  5/8"
                 
NAT.51210  NAT.51310 discontinued  1/2"  1/2"  500 1" to 1-1/4" diameter    2" 3/4"
NAT.51211    9/16"  1/2"   500  2    
NAT.51212    5/8"  1/2"   500  2
NAT.51213     11/16"  1/2"   500  2
NAT.51214     3/4"  1/2"   500  2
             
NAT.51215 discontinued    5/8"  5/8"  625 1-5/16" to 1-1/2" diameter  2
NAT.51216    11/16"  5/8"  625  2
NAT.51217    3/4"  5/8"  625  2
NAT.51218    13/16"  5/8"  625  2
NAT.51219 discontinued    7/8"  5/8"  625  2
             
NAT.51220    3/4"  3/4"  750 1-9/16" to 1-7/8" diameter  3
NAT.51222    7/8"  3/4"  750  3
NAT.51224    1"  3/4"  750  3
             
NAT.51228 discontinued    1"  1"  1000 1-15/16" to 2-3/4" diameter  4
NAT.51229 discontinued    1-1/8"  1"  1000  4
NAT.51230 discontinued    1-1/4"  1"  1000  4
NAT.51231 discontinued    1-3/8"  1"  1000  4

link to index page

 

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