daedalusminos
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Ah OK, there's no shim, it's a 16ER insert/holder but I know what you mean, will check holder for rubbing.
Other possibility is that your Belleville washers are loose and slipping. But Pressbrake is the expert. ;-)
Who was it on here that tried turning some material with the shim
Lol. Last read 3 mins ago your reply had nothing but a quote. Lol.See my post above
Because by the time we get our hands on the second hand ones we can afford the shim has long gone.why is it people like kicking around with those washers!
Because by the time we get our hands on the second hand ones we can afford the shim has long gone.
If he was thread milling on a cnc mill with bt type pull stud tooling that’s entirely possibleOther possibility is that your Belleville washers are loose and slipping. But Pressbrake is the expert. ;-)
Pressbrake1?
Why are you trying to mug me off?
M300 has a stack of sixteen Belleville washers on the leadscrew drive and twelve on the feed drive at the output of the feed gearbox. They act as a clutch to protect the gearbox. If someone has had the gearbox off and tinkered with them and not put them back in the correct series/parallel configuration with the right pre-load on the nut then the leadscrew might slip each time it engages the material, causing that weird offset thread that he has cut.If he was thread milling on a cnc mill with bt type pull stud tooling that’s entirely possible
I would have to hold my hand up to that one. In mitigation I was new to metal lathes and had ordered my first ever insert tool from Banggood they sent shims /anvils (I think they are called) instead of the cutting insert I had ordered and FYI they are not hard or sharpWho was it on here that tried turning some material with the shim
Please give good credence to Mr pressbrake's advice.
A good document showing the various permutations of holder, insert and shim is this one from Seco:
https://usercontent.azureedge.net/Content/UserContent/Documents/021367.pdf
It has charts showing what shim you need. Note that shim is dependent on helix angle not thread pitch (cutting 1mm pitch at 6mm dia. is quite a different helix angle to cutting 1mm pitch at 100mm dia.)
Haha, we’ve all gotta learn some way, it’s easily done.I would have to hold my hand up to that one. In mitigation I was new to metal lathes and had ordered my first ever insert tool from Banggood they sent shims /anvils (I think they are called) instead of the cutting insert I had ordered and FYI they are not hard or sharp
Haha, we’ve all gotta learn some way, it’s easily done.
I was trying poor humourM300 has a stack of sixteen Belleville washers on the leadscrew drive and twelve on the feed drive at the output of the feed gearbox. They act as a clutch to protect the gearbox. If someone has had the gearbox off and tinkered with them and not put them back in the correct series/parallel configuration with the right pre-load on the nut then the leadscrew might slip each time it engages the material, causing that weird offset thread that he has cut.
View attachment 242819
Washers are 34.6.22.4.0.5(DS), and 306.053 needs to be tightened to the correct torque with a pin spanner. I forget the correct washer configuration, but it’s something like two one way then two the other, repeated four times. Sort of: <<>><<>><<>><<>>
Note the tool bit is round so I can adjust to the helix