Great question about how to make clean sides on flat bottom 90° side bowls or boxes. Hopefully this will help out.
Enjoy
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Harvey Europe
https://www.harveywoodworking.de/
Harvey USA
https://harveymachinery.com/
Harvey Turbo T-40 Europe
https://www.harveywoodworking.de/products/turbo-t-40-14x24-wood-lathe-with-servo-motor?variant=43454009278659
KLINGSPOR CROATIA - https://www.klingspor.hr/
CLOTH BACK SANDPAPER - https://www.klingspor.hr/asortiman/brusni-valjci/kl-361-jf-3?konfektion=Rollen&werkstoffe=Holz
PAPERBACK SANDPAPER - https://www.klingspor.hr/asortiman/brusni-listovi/ps-33-b?seite=3&konfektion=Schleifbl%C3%A4tter&sortierung=Title
SANDING PAD - https://www.klingspor.hr/asortiman/brusni-listovi/hbd-150?seite=1&konfektion=Schleifbl%C3%A4tter&sortierung=Title
SCOTCHBRIDE PAD - https://www.klingspor.hr/asortiman/proizvodi-s-brusnim-runom/nro-400
150mm SANDING DISCS - https://www.klingspor.hr/asortiman/brusni-listovi/ps-33-bk-2?seite=3&konfektion=Schleifbl%C3%A4tter&sortierung=Title
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CRAFT SUPPLY USA WEBSITE
https://woodturnerscatalog.com/
VICMARK VM120 CHUCK
https://woodturnerscatalog.com/products/vicmarc-vm120-chuck-w-jaws?_pos=1&_sid=bfe025ac0&_ss=r
MOFFATT WORK LAMP
https://woodturnerscatalog.com/products/moffatt-compact-500-lumen-led-work-lamp?_pos=7&_sid=de3f128c6&_ss=r
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MY LATHE
https://drechslershop.de/en/wood-lathe-killinger-km-1450-se?sPartner=ttw
STEINERT WEBSITE
https://drechslershop.de/en/?sPartner=ttw
AFFILIATE LINKS.
NEUREITER and WOODCUT tools I use :
M42 BOWL GOUGES - https://neureiter.idevaffiliate.com/idevaffiliate.php?id=106&url=269
SCRAPERS - https://neureiter.idevaffiliate.com/idevaffiliate.php?id=106&url=268
CRYOGENIC BOWL GOUGES - https://neureiter.idevaffiliate.com/idevaffiliate.php?id=106&url=267
WOODCUT PRO CUTTER - https://neureiter.idevaffiliate.com/idevaffiliate.php?id=106&url=265
WOODCUT PRO ADVANCE - https://neureiter.idevaffiliate.com/idevaffiliate.php?id=106&url=264
IRONS SHEAR SCRAPER - https://neureiter.idevaffiliate.com/idevaffiliate.php?id=106&url=263
WOODCUT BOWL SAVER - https://neureiter.idevaffiliate.com/idevaffiliate.php?id=106&url=262
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GURTOOL TOOLS
Bowl gouge - https://www.gurtool.cz/gurtool-pm-dutinovy-struh-bez-rukojeti-16-mm-dlouhy-nabrus/
Spindle gouge -https://www.gurtool.cz/vretenovy-struh-bez-rukojeti/
Calipers - https://www.gurtool.cz/hmatadlo/
Sanding pads - https://www.gurtool.cz/unasec/
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https://www.tobi.si/en
CBN WHEEL
https://www.tobi.si/hr/CBN-brusna-ploca-200mm&tracking=644a469a6d4f4
BENCH GRINDER
https://www.tobi.si/hr/Stolna-dvostruka-brusilica&tracking=644a469a6d4f4
DIAMOND FILE
https://www.tobi.si/hr/Arbortech-diamantna-pila&tracking=644a469a6d4f4
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*disclaimer* Methods that are shown works great for me and they are not only methods out there, if you find this or any other method not comfortble,please use some other way.
Thank you and enjoy