Gallery, Projects and General > How do I??

Indexable insert holder, machining steps

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Mike K:
Thanks for posting that, Pekka.  Stefan has great ideas.

PekkaNF:
He explains reasoning and though process pretty well, doesn't he? He also tells when something is opinion or preference. I find his videos informative and more often than not I actually use something he has shown.

There are some pictures of one toolholder I cooked up. Making it was not difficult, designing how to mill the angles and grind the 35 degree insert to 40 degree insert was a challenge. When I decided to use round stock and ER Collet holder in a square block to implement compound angles all came out easy.

https://www.madmodder.net/index.php/topic,12967.msg155361.html#msg155361

Mike K:
Thanks, Pekka.  You do good work.  I hope someday to have a surface grinder, too.

PekkaNF:
I happy if that was any inspiration or help. My work is nowhere near same level of the gentlemen I linked, but they have been really inspirational to my work.

If I can make a toolholder, anybody can. For insert holder most important thing is pocket bottom: It must be flat and uniform and hard enough to support the insert. This is to prevent the relatively britle insert from breaking. Very accurate pocket is needed mostly to index the insert (you chip one, change new without disturbing the setup) and you are good to go - even if this happened just before finishing. Most of the time you could get away with just a fence on one side of the insert to counter the cutting forces. Some cases you could use just a pin to index one side of the insert (just put it to abut the insert to counter screw tightening torque, or tightening the screw might cam the insert out of index.

I made the pocket, because I wanted. I could just as easy to mill the top flat and put there a separate piece (fork kind of thingy) with glue/screw/solder and it would have worked fine, but milled pocket just looks more professional. Most likely does not affect my work at all, but we hobbyist work for the love of the art and not for profit.

That is actually a TCG American model but made in England, sold to Sweden, resold to Finland and I ended up buying it with 500€, because it one fried saw advertisement and offered to drive half the distance (about 740 km one way....) I rented the lorry on the morning, set off, buyer had a forklift to load and another friend offered come take it off near here at his storage, returned the lorry back late night. Weighting bit over a metric ton made it proverbial to transport home last 20 km and shove it into garage was another story.

There was a bunch of accessories with it. Some usefull, some worn out, some worn out beyond repair.

I needed to put new bearings into spindle and have new belt made. Crap load of cleaning and making sure that all oil galleries works. Nothing fatal or show stoppers, all basic stuff just a lot of TLC.

Making new shroud for the grinding wheel, balancing arbour and dust removal "system" has been taking some time too. Some fittings and features are still work in progress, I make them as I need them.

Pekka

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