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| MadNick:
Afternoon, The next task was to clean up the slot in the tool holder as, after measuring, it was clear the slot wasnt parallel to the base. This would certainly have added error to any angles that need to be ground. Last night I clamped everything up in the mill, not really preferred practice but there wasnt a lot of room - Does that get you wet?! It took me an hour or so to set things up, checking for deflection in x, y and z and left any machining until this afternoon - I machined the slot out and measured up - all good. Then the plan was to use a bit of brass as a point for the holder. I came up with this - Thats it for the moment. Im making a start on an attachment to grind end mills. Nick |
| Fergus OMore:
Always remember that the lips of end mills and slot drills are ground almost parallel to the grinding wheel- giving 'a toe in' of not more than a couple of degrees. So you don't need the protractor ring. What you do need is the ability to hold the halves or quarters and the ability to get the first and secondary clearances but having stops to avoid crossing over too far. The last is an error which will destroy your end mill. That is why I prattled on to you about a different holder. Of course, you can do it but take heed of just how careful one needs to be. Cheers Norman |
| MadNick:
Norman. Good to hear from you :) Im still considering a design for the end mill holder and need to do more research. Until then im going to get the thing fitted to its base and running so I can practice on some lathe bits and one for the fly cutter. Nick |
| Fergus OMore:
Yes, you are following a well trodden path to gain experience. Once you are familiar with doing square lathe tools, you move on to working in 'the round' with lathe tools and then you begin to have to think about your maths and angles and things. Sadly, few of us progress into such rarified stuff. However, there are bits of useful guidance. Chaddock in his Quorn book gives lots of guidance and so does Thomas especially in his Model Engineers Workshop Manual. What you are going to find is that the two Kennet tool holders will do it all but it does require a lot of head scratching to get angles right. At this point, I would suggest that you gain experience with them and them move on to more complicated tool holders later. It is not going to dawn on you- just like that but it will come as you progress. Cheers N |
| MadNick:
Thanks Norman. Would you be able to advise as to the diameter of the pulleys for my abominable 1/4hp motor please? Getting closer, I fitted the grinder to the base today, just need to figure out the best way for the motor to sit. nick |
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