Differences

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--- techtalk:ref:tools147 [2019/05/10 00:14]
hippysmack [Pre-Ream Drill Hole Size Chart]
+++ techtalk:ref:tools147 [2020/08/25 00:51]
hippysmack [Types of Reamers]
@@ Line 5: / Line 5: @@
   * [[techtalk:ref:genmsr11|Cutting Oils, Soaking Oils and Lubes]]
-  * [[techtalk:ref:svcproc40#general_drilling_and_tapping|General Drilling and Tapping]]
+  * [[techtalk:ref:tools030#general_drilling_and_tapping|General Drilling and Tapping]]
 ====== Types of Reamers ======
@@ Line 14: / Line 14: @@
     * This usually means line reaming (aligning it with a hole, or bearing, opposite and at the other end of a shaft).
   * Line Reaming: ((oldmetal of the XLFORUM http://xlforum.net/forums/showthread.php?t=51086))
     * Line reaming is the process of using additional support features to help provide shaft alignment. In this case of reaming cam bushings, it is the cam cover and its associated bushing that is used to "line up" the reaming tool so that the bushing hole in the right crankcase is cut to the correct size diameter, is properly located horizontally, and is cut square to the intended shaft axis.
+  *  Flute spirals. ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1717904&page=3)) \\ All 3 reamers here are "right hand cut" meaning they all cut while being spun in the same direction as a drill bit. \\ Reamers come in different cuts as in straight, forward spiral, reverse spiral etc. Looking at the last one, you may think is cuts in reverse rotation but it does not.
+    * Straight reamers are by far the least expensive to buy. It also makes holes that aren't true cylinders. \\ They can have a lobed wall shape. This lobing goes hand in hand with amount of material being reamed away. \\ In our case it's a small amount of removal so the lobing is also very small. \\ For us it's ok for pinion & #2. But a spiral is nicer albeit usually 2X the cost. \\ It's also fine for 1-3-4 if bushes have no oil groove in bore. \\ Grooves in bore need the gap bridging action that spirals provide. \\ This is where you need spirals.
+    * Forward Spiral reamers will give a truer (but not perfect) cylinder. \\ Forwards gives the lowest cutting forces = easiest to hand ream with. \\ But they can 'grab' into the work (like a drill sometimes does).
+    * Reverse Spiral reamers are the best of the 3 for surface finish. \\ High cutting forces due to the reverse rake at the cutting edge makes the roundest holes of all three when driven by hand. \\ High safety in use. It won't toss you any curve balls but they dull quick. \\ All reamers when dull are useless.
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 |  "Jims" makes this reamer referenced to HD part number (94804-57) ((photos by Hippysmack))  ||
 |{{:techtalk:ref:tools:jims_94804-57_rocker_bushing_reamer_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:tools:jims_94804-57_rocker_bushing_reamer_2_by_hippysmack.jpg?direct&300|}}|
+===== Cam Bushing Reamers =====
+\\
+==== Outer Cam Bushings ====
+(AKA Cam Cover Bushings): \\
+The reamers for the cam cover bushings (#1, #3 and #4) need to be chamfered (chucking) reamers. \\
+The ends have a short chamfer that will enter the blind bushing bore and not hit the rear of the bore before finished cutting the bushings. \\
+The reamer for #2 cam can be a tapered bridge reamer on models with nosecone ignitions. \\
+(the hole for #2 cam is open  to atmosphere so the reamer has plenty of room to extend past the bushing) \\
+Else it will also need to have a chamfered end. \\
+Cam cover reamer sizes: \\
+-1990:
+/16" for the pinion shaft and idler bushing. \\
+-1/8" for #2 cam bushing. \\
+/16" for #1, #3 and #4 cam bushings. \\
+-up:
+/8" for the pinion shaft bushing. \\
+-1/8" for #2 cam bushing. \\
+/16" for #1, #3 and #4 cam bushings. \\
+==== Outer Cam Bushings ====
+(AKA Case Bushings): \\
+A single reamer is all that is needed for the case side bushings as all the cam bushings are the same size in the case. \\
+The normal way of reaming the case bushings is to split the case and ream case bushings by using the cover bushings as a guide. \\
+This will require a bridge reamer with a tapered end. \\
+If reaming the case bushings from the outside of the cover bushings, you'll need a chamfered (chucking) reamer with a short chamfer. \\
+The long taper will go in and touch the flywheel before the blades have a chance to cut into the reamer. \\
+So reaming the case side bushings will not be possible with a bridge reamer from the outside of the cover.
+Case bushing reamer size: \\
+/16" for #1 thru #4 cam bushings. \\
+|  Cam bushing reamers ((photo by decman of the XLFORUM http://xlforum.net/forums/showthread.php?postid=5016753))  |
+|{{:techtalk:ref:tools:cam_bushing_reamers_by_decman.jpg?direct&300|}}|
 ===== Calculating Pre-Ream Drill Hole Sizes =====

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