Internal Retaining Ring Groove Tool
I can just grab a piece of tool steel and go stand in front of the
grinder for a while, but I was wondering if there is a simple elegant, not over priced tool to do the job. Ring groove will likely be 1.1" give or take. |
Internal Retaining Ring Groove Tool
"Bob La Londe" wrote in message ... I can just grab a piece of tool steel and go stand in front of the grinder for a while, but I was wondering if there is a simple elegant, not over priced tool to do the job. Ring groove will likely be 1.1" give or take. https://www.sandvik.coromant.com/en-...ing-tools.aspx The ones I bought in a second-hand tool store look like the CoroTurn XS, ground from solid rod. |
Internal Retaining Ring Groove Tool
On 28/07/2019 22:02, Bob La Londe wrote:
I can just grab a piece of tool steel and go stand in front of the grinder for a while, but I was wondering if there is a simple elegant, not over priced tool to do the job.Â*Â* Ring groove will likely be 1.1" give or take. If not large quantities why not grind a HSS or carbide bit to suit a boring bar which can hold a bit at 90 degrees to the bar axis. I have a number of bits for such tasks for internal threading or grooving. This type of thing https://www.ebay.co.uk/itm/19-MM-BOR...pid=1188831138 |
Internal Retaining Ring Groove Tool
On Sun, 28 Jul 2019 14:02:52 -0700, Bob La Londe
wrote: I can just grab a piece of tool steel and go stand in front of the grinder for a while, but I was wondering if there is a simple elegant, not over priced tool to do the job. Ring groove will likely be 1.1" give or take. boring bar with square (cut-off) blade |
Internal Retaining Ring Groove Tool
"Bob La Londe" wrote in message ...
I can just grab a piece of tool steel and go stand in front of the grinder for a while, but I was wondering if there is a simple elegant, not over priced tool to do the job. Ring groove will likely be 1.1" give or take. ********** Seems the old school round boring bar with square broach and set screw might be the best tool for this job. Atleast I can pregrind two or three HSS bits the same for this if I wind up doing a bunch of them. Now about face trepanning a recess that butts up against a shank diameter. For now I have been using a hand ground brazed carbide inside threading tool. It no longer looks like a theading tool and has relief on one side for the smallest diameter of the recessed area. |
Internal Retaining Ring Groove Tool
"Bob La Londe" wrote in message
... "Bob La Londe" wrote in message ... I can just grab a piece of tool steel and go stand in front of the grinder for a while, but I was wondering if there is a simple elegant, not over priced tool to do the job. Ring groove will likely be 1.1" give or take. ********** Seems the old school round boring bar with square broach and set screw might be the best tool for this job. Atleast I can pregrind two or three HSS bits the same for this if I wind up doing a bunch of them. Now about face trepanning a recess that butts up against a shank diameter. For now I have been using a hand ground brazed carbide inside threading tool. It no longer looks like a theading tool and has relief on one side for the smallest diameter of the recessed area. I use a worn surface grinder I bought for $100 to grind lathe bits to close angular and dimensional tolerance, after roughing them with an angle grinder and then a bench grinder. If your toolpost will swivel to it, 45 degrees is a good tool bit angle for custom inside corner tools, ground into the end of the bit. For that tool grind the end slightly less than 45 degrees for side relief and grind a vee notch to form the outer cutting edge, then relieve for circular clearance. I have a Multifix that indexes in 9 degree steps. |
Internal Retaining Ring Groove Tool
On 7/30/2019 4:49 PM, Jim Wilkins wrote: "Bob La Londe" wrote in message ... "Bob La Londe" wrote in message ... I can just grab a piece of tool steel and go stand in front of the grinder for a while, but I was wondering if there is a simple elegant, not over priced tool to do the job. Ring groove will likely be 1.1" give or take. ********** Seems the old school round boring bar with square broach and set screw might be the best tool for this job. Atleast I can pregrind two or three HSS bits the same for this if I wind up doing a bunch of them. Now about face trepanning a recess that butts up against a shank diameter. For now I have been using a hand ground brazed carbide inside threading tool. It no longer looks like a theading tool and has relief on one side for the smallest diameter of the recessed area. I use a worn surface grinder I bought for $100 to grind lathe bits to close angular and dimensional tolerance, after roughing them with an angle grinder and then a bench grinder. If your toolpost will swivel to it, 45 degrees is a good tool bit angle for custom inside corner tools, ground into the end of the bit. For that tool grind the end slightly less than 45 degrees for side relief and grind a vee notch to form the outer cutting edge, then relieve for circular clearance. I have a Multifix that indexes in 9 degree steps. The QCTP on the PM1440 free spins so I can set it at any angle. I can see how turning it would work with the 45 degree bar. The lathe bit would have to stick out a little more, but it would work. I've been playing with the idea of CNC roughing the part on the mill, and then just throwing it in the lathe to finish. Maybe leave the OD 10 thou over, and the ID 10 thou under on the two dimensions that need to be pretty concentric and just finish those on the lathe. |
Internal Retaining Ring Groove Tool
On Sunday, July 28, 2019 at 2:02:55 PM UTC-7, Bob La Londe wrote:
I can just grab a piece of tool steel and go stand in front of the grinder for a while, but I was wondering if there is a simple elegant, not over priced tool to do the job. Ring groove will likely be 1.1" give or take. If it were for a big bore cylinder, I'd consider a slitting saw blade with suitable width, even if it were broken (just choose a good tooth, and take aim). Hand-sharpening a square cutter for a composite boring bar could work, but it's not something where I can really see the cut, so if I sharpen it wrong... how would I ever be able to correct it? |
Internal Retaining Ring Groove Tool
"whit3rd" wrote in message
... On Sunday, July 28, 2019 at 2:02:55 PM UTC-7, Bob La Londe wrote: I can just grab a piece of tool steel and go stand in front of the grinder for a while, but I was wondering if there is a simple elegant, not over priced tool to do the job. Ring groove will likely be 1.1" give or take. If it were for a big bore cylinder, I'd consider a slitting saw blade with suitable width, even if it were broken (just choose a good tooth, and take aim). Hand-sharpening a square cutter for a composite boring bar could work, but it's not something where I can really see the cut, so if I sharpen it wrong... how would I ever be able to correct it? The lathe dial gives you the depth of the groove and these can measure its width and position: https://ecatalog.mitutoyo.com/Groove...146-C1131.aspx |
Internal Retaining Ring Groove Tool
"Bob La Londe" wrote in message
... On 7/30/2019 4:49 PM, Jim Wilkins wrote: "Bob La Londe" wrote in message ... "Bob La Londe" wrote in message ... I can just grab a piece of tool steel and go stand in front of the grinder for a while, but I was wondering if there is a simple elegant, not over priced tool to do the job. Ring groove will likely be 1.1" give or take. ********** Seems the old school round boring bar with square broach and set screw might be the best tool for this job. Atleast I can pregrind two or three HSS bits the same for this if I wind up doing a bunch of them. Now about face trepanning a recess that butts up against a shank diameter. For now I have been using a hand ground brazed carbide inside threading tool. It no longer looks like a theading tool and has relief on one side for the smallest diameter of the recessed area. I use a worn surface grinder I bought for $100 to grind lathe bits to close angular and dimensional tolerance, after roughing them with an angle grinder and then a bench grinder. If your toolpost will swivel to it, 45 degrees is a good tool bit angle for custom inside corner tools, ground into the end of the bit. For that tool grind the end slightly less than 45 degrees for side relief and grind a vee notch to form the outer cutting edge, then relieve for circular clearance. I have a Multifix that indexes in 9 degree steps. The QCTP on the PM1440 free spins so I can set it at any angle. I can see how turning it would work with the 45 degree bar. The lathe bit would have to stick out a little more, but it would work. I've been playing with the idea of CNC roughing the part on the mill, and then just throwing it in the lathe to finish. Maybe leave the OD 10 thou over, and the ID 10 thou under on the two dimensions that need to be pretty concentric and just finish those on the lathe. I use the appropriate hole in a drill bit gauge or a washer to show when I've hand ground enough circular relief below the cutting edge. |
Internal Retaining Ring Groove Tool
On Sun, 28 Jul 2019 14:02:52 -0700, Bob La Londe
wrote: I can just grab a piece of tool steel and go stand in front of the grinder for a while, but I was wondering if there is a simple elegant, not over priced tool to do the job. Ring groove will likely be 1.1" give or take. You can have elegant..or you can have over priced...but you cannot have cheap and perfect. (Grin) Check Ebay. internal groove cutters can be found there for about 25% or less of new. Ill check my boxes of Stuff..but if memory serves..I dont have any Id care to part with. As a side note...I did make one up for a client who needed one RIGHT NOW!. I took an insert cut off tool, cut off an appropriate distance..and tig welded it at a 90' right angle. Damned sure wasnt pretty..but they are still running it, a year later. Shrug Gunner __ "Poor widdle Wudy...mentally ill, lies constantly, doesnt know who he is, or even what gender "he" is. No more pathetic creature has ever walked the earth. But...he is locked into a mental hospital for the safety of the public. Which is a very good thing." Asun rauhassa, valmistaudun sotaan. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
Internal Retaining Ring Groove Tool
On Wed, 07 Aug 2019 15:40:29 -0700, Gunner Asch
wrote: On Sun, 28 Jul 2019 14:02:52 -0700, Bob La Londe wrote: I can just grab a piece of tool steel and go stand in front of the grinder for a while, but I was wondering if there is a simple elegant, not over priced tool to do the job. Ring groove will likely be 1.1" give or take. You can have elegant..or you can have over priced...but you cannot have cheap and perfect. (Grin) Check Ebay. internal groove cutters can be found there for about 25% or less of new. Ill check my boxes of Stuff..but if memory serves..I dont have any Id care to part with. As a side note...I did make one up for a client who needed one RIGHT NOW!. I took an insert cut off tool, cut off an appropriate distance..and tig welded it at a 90' right angle. Damned sure wasnt pretty..but they are still running it, a year later. Shrug Gunner __ Many years ago, when I first got a unimat, I needed to cut an internal groove. Not knowing any better, I fashioned a boring tool from the head of a concrete nail, shimmed it in place and produced an acceptable internal notch that functioned well enough that I still have that item available for use. |
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