Here is a list of all the postings Peter Caswell has made in our forums. Click on a thread name to jump to the thread.
|Thread: EN3 bowing after machining|
Many thanks for all your replies to my post.
I now know what to do in the future and have a good solution from Nigel McBurney to true up the parts, while in the vice I can drill and tap for the stud and all will be square.
Many thanks for that explanation Clive F, as Clive B1 suggested I should have reduced the thickness equally from both sides but I guess from your explanation I would have to have it on its side, so to speak, to equally machine the top and bottom with very light cuts, as you said that would mean some creative work holding. Perhaps I should try some hot rolled!.
Apologies if this under the wrong topic but it seemed the most appropriate. still learning and always will be and need some help and guidance regards machining EN3.
I wanted to make some Tee nuts, I had a 300mm length of EN3 20x20mm, I machined this to a Tee profile to chop up into 21mm lengths to make the tee nuts. It was rigidly clamped on the milling table and machined, reducing the height to 14mm, the width of the foot to 19mm with a 7mm step with the remainder to a width of 12mm.
Now the problem, when I unclamped it from the mill table it had a bow in it, the foot of the Tee being concave there being a gap just off centre of 1mm, I guess it was due to stresses being released (or created) during the milling,
As I am going to cut it up in 21mm lengths I can probably still use it, but what did I do wrong and how can I prevent repeating this.
Have put the project to one side now awaiting your knowledgeable replies.
|Thread: Countersink choices|
That what I have found Neil, the HSS multi flutes just don't seem to cut steel, of course it could be me, I must confess to date I have used same ones in both hand tools and machine tools, my new ones will be dedicated to machine tools. I have ordered a set of single flutes following the link that Roderick Jenkins kindly posted.
|Thread: Micrometer woes|
Thanks for that tip on the vinyls Bill, have several cases from 60's and later stashed away, will have to have a check, no looking to forwarding to accessing them though..
|Thread: Countersink choices|
Speedy Builder5 not what I am really looking for but it is interesting bit of kit and thanks, Haven't looked to see if these available in the UK but will do so out of interest.
Thanks Jason, found a 12.4mm Ruko 3 flute at a reduced price at £7.30 (ex VAT) instead of £12.17 (ex VAT) but don't know if that is a good price?
Note your comment about black bar not something I have not used much of to date.
Thanks Doug and pgk (learning may around on this forum, is this the right way to thank replies to a post I made?)
Hello members of MEW Forum, this is my first post so please forgive me for any errors in protocol.
Could I please request the members to share their experiences and views of countersink bits.
I wish to replace my old HSS multi flute ones which I have never been entirely happy with regards to the concentricity of the countersinks they form and slow cutting (probably because of dull cutting edges), also the difficulty of re-sharpening, which I have neither the experience or equipment to do so. The types of countersink are many and of course manufactures and sellers favour the ones they make/sell. Also the cost varies widely from a few pounds for a set from the far east to upwards of £70 for one cutter from well known brands and a whole host in between. In advance of advice, for ease of resharpening maybe I favour single flute cutters. I would particularly welcome any experience of far east ones as I have had reasonable experiences of end mills from there, which are cheap enough to throw away (after use I mean!).
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