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| NickG:
Good stuff Chris, I will be watching and hopefully learning as my 1 way tool post is annoying me so much I'm very tempted to make this my next project now! |
| raynerd:
Got a little more done today and all thanks to my new 2 1/2 end mill cutter! Cuts the stuff like butter and with a 90deg side, it also allowed me to do up to a square side ready for the dovetails: I have put a first drill down it but couldn`t go further since I need a 5/8" drill. Since it being perfectly central is not critical, I`ll be able to set this back up on the lathe for the centre drill and bore. Anyway - massive problems now since I purchased a 45deg dovetail cutter but it doesn`t seem to want to cut for me! It just screams. I`ve tried changing the speeds and nothing. It is making a cut but really really slowly and a terrible sound. Any adivce? Chris |
| Darren:
--- Quote from: craynerd on September 12, 2009, 04:57:45 PM --- Anyway - massive problems now since I purchased a 45deg dovetail cutter but it doesn`t seem to want to cut for me! It just screams. I`ve tried changing the speeds and nothing. It is making a cut but really really slowly and a terrible sound. Any adivce? Chris --- End quote --- Use your shaper........ :lol: Sorry, couldn't resist.....but shapers do make dovetails rather easily. Never used a dovetail cutter on the mill, but it sounds like you might be tickling it at too high a speed? I'm just guessing, wait for someone who might actually know something to come along..... :thumbup: You need to remove as much material as you can before using the dovetail cutter, I can tell you that much. |
| bogstandard:
A dovetail cutter is a very fragile toobit. By the sounds of it, you have already done it fatal damage. You need very fine feeds and lots of coolant and lube. I made a new topslide for a lathe last year out of gauge plate, which I am sure is just as tough as the stuff you are using, but because of the way the cutter was treated, it is still as good as brand new, and will be used again when I make some tooling for my lathe. Sounds like a very expensive mistake to me. You can use a flycutter to make external dovetails fairly easily, but you need to be able to grind the tool accurately. In fact, when I come to cut mine, I will most probably use a flycutter for most of the rough metal removal, and save the precious dovetail cutter for final finishing. Bogs |
| raynerd:
Humm, thanks for the reply John. That is good idea, so basically grind up some HSS perhaps just short of 45deg and use that as a single point cutting tool in the flycutter. Then use the dovetail to finish the job after the bulk of the material has been removed by the flycutter. I could possibly have damaged my dovetail cutter but it seems fine enough, still as sharp as before and no noticable damage. I didn`t use it for very long, only a minute before I realised I was rushing and decided to leave while I found some more info. Will have to see if I have spoilt it but I guess not.... I`ll give the flycutter method a go and I guess the cutter shape would be just less than 45deg to allow the finish to be put on with the dovetail cutter. Thanks for the suggestion. I`ll let you know how I get on tomorrow. Darren - I really wanted to use my shaper for the dovetails but I`m still having issues. I`ve smashed a piece of the pully trying to remove it from the shaft - it has all siezed up and I think I hit it a bit hard :doh:. Now I need to drill a hole for some brackets and then mount it but it is getting around to doing it. If I`m being honest, it is the only bit of kit that isn`t here at my house, it is at my grandparents as I don`t have any room for it here (it won`t fit in the cellar), consequently I don`t get much time to work on it, or at least I have to make more of an effort. I hope to have it running in the next few weeks, although I said that a month ago! Chris |
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