- Jan 18, 2023
- Rock Creek BC
Does anyone have a holding jig to hold a con rod on mill table, to bore small end parallel with big end?
Like I said you must straighten first for best results.Two long rods makes it so easy.I am working on vintage harley motors. The manual tells you to check for a bent or twisted rod, with a checking pin in wrist pin hole and laying across motor cases. and to straighten bent or twisted con rods by bending rod with a bar. This method does work, but I am trying to get away from that by boring a new wrist pin bushing that is perfectly parallel with big end of con rod. I am just trying to figure out how to make a jig that will hold the big end perfectly square with table. Thanks in advance for any replys.
find a good engine machine shop with a sunnen hone, rough bore 8-10 thou large, then hone within a few tenths.Does anyone have a holding jig to hold a con rod on mill table, to bore small end parallel with big end?
Yes Sir, I have been looking for a Tobin Arp rod machine for years. The ultimate rod boring machine. They were made in Minnesota, and Sunnen bought them out in the early 80's.find a torbin arprod machine, not only square and parallel bores but equal center to center distance
The spud sounds like a good idea, but I need it to expand and lock the rod perfectly square with table. I rebuild 2 sizes of rods, 45" rods and big twin rods. Each time the big end gets sized, The I.D. gets larger, so I need to figure out how to make an expansion spud ?Make a spud with a hole drilled thru the center with the OD the same size as your big end bore. Make sure to face the end of the spud square with the OD. Bolt the spud on the mill table and put the big end of the rod around the spud. A small vise at the other end or better a simple block with two pointed set screws to bite the sides of the small end of the rod ..............hope you get the idea- square up your spindle and you're ready to go.
I am not familiar with the Sea Lion, but I know KR Wilson was a quality tool maker.The "sea lion" was made by KR Wilson to be used for checking Ford rods on their con rod fixture- suppose you could use it for any thing...................
O.S. pins are available, but not needed with a new W.P. bushing and new piston pin.If you bore out the small end, you need an oversize piston pin. Do they make pistons with oversize pin holes?
I have the S&S checking pin, and the Sunnen hone and dozens of mandrels. I'm just trying to re invent the wheel, if I can make both bores perfectly parallel, then I won't need to bend the rod. Any chance you could post a pic of your storm vulcan rod alignment machine? ThanksS&S Cycle sells an accurate checking pin for harley rod alignment. I use that and a Storm Vulcan rod alignment machine for all the Harley engines I do. Sunnen made rod alignment machines too. You can check bow and twist easily and correct any issues.
You should be looking for a Berco rod mschine. More flexible than the TA.The spud sounds like a good idea, but I need it to expand and lock the rod perfectly square with table. I rebuild 2 sizes of rods, 45" rods and big twin rods. Each time the big end gets sized, The I.D. gets larger, so I need to figure out how to make an expansion spud ?