On Friday, 1 May 2020 11:34:24 UTC+1, Dave Plowman (News) wrote:
In article ,
tabbypurr wrote:
On Thursday, 30 April 2020 14:56:33 UTC+1, Dave Plowman (News) wrote:
In article ,
tabbypurr wrote:
On Thursday, 30 April 2020 11:37:57 UTC+1, Dave Plowman (News)
wrote:
In article
,
tabbypurr wrote:

Interesting. Last time I used those, long ago, they severely
distorted the sheet they were punching. Is there some way to
avoid that?

Get some decent quality ones? If the tolerances are poor, it won't
shear accurately.

The ones I was using were the Qmax you recommended.

What were you cutting?

boxes, mainly sheet ali. IIRC they were fine in plastic.

I've made loads and loads of holes with them in various materials and
not had a problem with distortion. Assuming you took care using them,
as it would obviously be possible to bend sheet steel by the action of
turning them with a spanner, etc.

With the metal in free air it's not going to see problematic torque.

Given you'd normally hold the work while using the cutter, not so sure
about that.

But it sounds like you were using a worn cutter. If a common problem.

They were brand new. I explained why it happened several posts back.


NT