AlfaGTA
Diamond
- Joined
- Dec 13, 2002
- Location
- Benicia California USA
This will be a bit long winded, so bear with me.
First my apologies, the machine in question is not a Deckel or other Euro make, but in fact made in the USA.
But thought since its sort of unusual it might be OK to post it here......
Bought this machine perhaps 10 years back, but never pressed it into service. Have a job pending that screams out for the capabilities of this machine, so i brought it back to life.
Its a "Tobin-Arp" cam line boring machine. Built to allow boring of overhead cam housing bores in cylinder heads.
I have a set (2) of cylinder heads that were made new (reproduction) for an overhead cam V-8. Problem is that the cam bores were supplied unfinished, under size and having caps that were never fitted....
Starting out at just under 1" bore (sort of) and needing to be finished at 32mm. The diameter and length make doing the bores on my full sized Berco line boring machine impossible.
This is a pretty simple machine. The spindle is fixed with no vertical or side to side movement. Simple belt with different pulleys to give some speed variation.
Feed is via hydraulic cylinder that is powered by applying air pressure over the oil reservoirs...Direction of the feed is controlled by pneumatic valves while needle valves are used to control the rate.
There is a drive shaft held in position to the hydraulic cylinder by a collet which allows changing the reach of the drive that couples to the boring bar......
The only real adjustable part of the machine are the support rails that the work (head) is mounted to....These rails can be moved up and down to accommodate different sized work thicknesses.
For fine adjustment there are special parallels that set across the rails.
These parallels can move using adjusting screws both up and down, and in/out....so each end of the part can be trimmed to align the housing bore true to the fixed position boring bar .
Overall view of the machine.
Black parts crossing the machine at the lower part of the photo is a parallel. (one of two) Fitted to the parallel is a shop built fixture (more about this later).
Trick part is the boring bar support and the dovetail way that they fit up to that you can see running along the top of the machine....
Nice part is that the bearings that carry the bar are in rather narrow over arms that can be positioned anywhere along the upper dovetail...small enough to fit between the bearings so
that even though the bar is small (15/16") you can get right next to the bore you are machining.....
Here a view of one of the overarms ...Locates on the upper "V" and against the lower flat.....Overarms made with a cam quick release pull down so moving the arms is quick and easy...
Note the "U" joint coupling (shop built) between the boring bar and the drive shaft....
View of the machine control panel and drive shaft extending from the collet that is connected to the hydraulic feed system....
Note tool setting gauge on top of the operators panel....Setting gauge is stock tooling from my Berco line boring machine...
More to follow.....
Cheers Ross
First my apologies, the machine in question is not a Deckel or other Euro make, but in fact made in the USA.
But thought since its sort of unusual it might be OK to post it here......
Bought this machine perhaps 10 years back, but never pressed it into service. Have a job pending that screams out for the capabilities of this machine, so i brought it back to life.
Its a "Tobin-Arp" cam line boring machine. Built to allow boring of overhead cam housing bores in cylinder heads.
I have a set (2) of cylinder heads that were made new (reproduction) for an overhead cam V-8. Problem is that the cam bores were supplied unfinished, under size and having caps that were never fitted....
Starting out at just under 1" bore (sort of) and needing to be finished at 32mm. The diameter and length make doing the bores on my full sized Berco line boring machine impossible.
This is a pretty simple machine. The spindle is fixed with no vertical or side to side movement. Simple belt with different pulleys to give some speed variation.
Feed is via hydraulic cylinder that is powered by applying air pressure over the oil reservoirs...Direction of the feed is controlled by pneumatic valves while needle valves are used to control the rate.
There is a drive shaft held in position to the hydraulic cylinder by a collet which allows changing the reach of the drive that couples to the boring bar......
The only real adjustable part of the machine are the support rails that the work (head) is mounted to....These rails can be moved up and down to accommodate different sized work thicknesses.
For fine adjustment there are special parallels that set across the rails.
These parallels can move using adjusting screws both up and down, and in/out....so each end of the part can be trimmed to align the housing bore true to the fixed position boring bar .
Overall view of the machine.
Black parts crossing the machine at the lower part of the photo is a parallel. (one of two) Fitted to the parallel is a shop built fixture (more about this later).
Trick part is the boring bar support and the dovetail way that they fit up to that you can see running along the top of the machine....
Nice part is that the bearings that carry the bar are in rather narrow over arms that can be positioned anywhere along the upper dovetail...small enough to fit between the bearings so
that even though the bar is small (15/16") you can get right next to the bore you are machining.....
Here a view of one of the overarms ...Locates on the upper "V" and against the lower flat.....Overarms made with a cam quick release pull down so moving the arms is quick and easy...
Note the "U" joint coupling (shop built) between the boring bar and the drive shaft....
View of the machine control panel and drive shaft extending from the collet that is connected to the hydraulic feed system....
Note tool setting gauge on top of the operators panel....Setting gauge is stock tooling from my Berco line boring machine...
More to follow.....
Cheers Ross