implmex
Diamond
- Joined
- Jun 23, 2002
- Location
- Vancouver BC Canada
Good morning All:
I had to grind a single point bar for an M2 x 0.4 internal thread that needs to be single pointed to keep it as concentric to other features as I can.
I know you can sometimes buy stuff like this if you're willing to wait for it, but sometimes I'm not or I need something weird that I can't get.
So this bar is 0.058" across the tip (it'll go into an 0.058" hole).
It took a long time to make because it's so small and I can't see well enough anymore even with a 10X magnifier to be sure I got the geometry right, so I grind a bit, shadowgraph it, grind a bit more, scope it, etc etc.
Each time it needs to be picked up on the grinder again...a royal and time wasting PITA.
Almost 3 hours to grind this bar...that's a pricey bar but I need it this week and I got it today (nutso customer deadline...the purchaser forgot to include the part this tool was made for, in the order...now there's a crisis)
My question to all of you...if you can't buy one from the store in a reasonable amount of time, what do you do?
Turn down the job?
Bodge something together like I've done?
Make the customer wait?
Pressure a vendor to drop everything and make you a special?
I look at CNC cutter grinders popping out cutters like pancakes and I am green with envy and want one so I can do it too.
But under almost every circumstance, it's a stupid idea for a prototype shop to invest in something like this.
My way still kinda works, but it depends on me...I doubt you could hire this capability anymore, and most shops don't have the gear anyway.
So what do you guys do?
Cheers
Marcus
www.implant-mechanix.com
www.vancouverwireedm.com
I had to grind a single point bar for an M2 x 0.4 internal thread that needs to be single pointed to keep it as concentric to other features as I can.
I know you can sometimes buy stuff like this if you're willing to wait for it, but sometimes I'm not or I need something weird that I can't get.
So this bar is 0.058" across the tip (it'll go into an 0.058" hole).
It took a long time to make because it's so small and I can't see well enough anymore even with a 10X magnifier to be sure I got the geometry right, so I grind a bit, shadowgraph it, grind a bit more, scope it, etc etc.
Each time it needs to be picked up on the grinder again...a royal and time wasting PITA.
Almost 3 hours to grind this bar...that's a pricey bar but I need it this week and I got it today (nutso customer deadline...the purchaser forgot to include the part this tool was made for, in the order...now there's a crisis)
My question to all of you...if you can't buy one from the store in a reasonable amount of time, what do you do?
Turn down the job?
Bodge something together like I've done?
Make the customer wait?
Pressure a vendor to drop everything and make you a special?
I look at CNC cutter grinders popping out cutters like pancakes and I am green with envy and want one so I can do it too.
But under almost every circumstance, it's a stupid idea for a prototype shop to invest in something like this.
My way still kinda works, but it depends on me...I doubt you could hire this capability anymore, and most shops don't have the gear anyway.
So what do you guys do?
Cheers
Marcus
www.implant-mechanix.com
www.vancouverwireedm.com
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