show us a link of the parting tools you mean, that may help. I'm guessing the smaller ones are cheaper so they will sell more.
and I replied to your post on another thread last week, this is the parting tool I use normally on my hobbymat lathe
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New 5/16 Sq Shank Clamp Type Parting Tool with 100mm M-35 HSS Chipbreaker Blade - Chronos Engineering Supplies
New 5/16 Sq Shank Clamp Type Parting Tool with 100mm M-35 HSS Chipbreaker Blade from Chronos Engineering Supplies. Free UK delivery and great worldwide rates.www.chronos.ltd.uk
but for "small" jobs Ive got a parting tool that is 0.6mm wide x 3.2mm tall
I’ve got one of those. Avoid - it’s rubbish.
In what way is it rubbish?I’ve got one of those. Avoid - it’s rubbish.
I strongly recommend biting the bullet and getting a narrow insert tool:
SLTBN Part Off Blade Tool Blocks with Blade - Arc Euro Trade
SLTBN part off tool blocks with NCIH self-locking parting blades and GTN inserts. Sizes: 6-16mm shank, blades for 2mm & 3mm GTN insertswww.arceurotrade.co.uk
Even on a mini lathe it’s far better.
In what way is it rubbish?
Its a Clarke cl300m mini lathe, currently the base of the toolpost slot to centre height is ~10.3mm since I milled it down so I use 10x10 insert tools with a shim to get the right height as it was 8x8 brazed carbide tools that came with it.6mm and 8.25mm are the depths of the blades, I think you'll you won't be able to tell the difference with a 1.5mm and1.45mm cut once you have allowed for some blade clearance.
How big a blade holding tool can you fit in the toolholder?
The blade isn't held either securely enough or accurately enough: The blade tends to cock over as you tighten the clamp, and even if you spend ages getting it to stay vertical, it tends to twist off sideways in use. If/when it digs in, the little clamp screw snaps.In what way is it rubbish?