Used Centering for sale (14,301)

  • Sort results

  • Lowest price Highest price
  • Newest listings Oldest listings
  • Shortest distance Farthest distance
  • Newest year of manufacture Oldest year of manufacture
  • Latest update Oldest update
  • Manufacturer A to Z Manufacturer Z to A
  • Relevance
Lowest price
Price
Highest price
Price
Newest listings
Release date
Oldest listings
Release date
Shortest distance
Distance
Farthest distance
Distance
Newest year of manufacture
Year of construction
Oldest year of manufacture
Year of construction
Latest update
Update
Oldest update
Update
Manufacturer A to Z
Manufacturer
Manufacturer Z to A
Manufacturer
designation from A to Z
Description
designation from Z to A
Description
Model from A to Z
Model
Model from Z to A
Model
Lowest reference
Ref.No.
Highest reference
Ref.No.
Shortest runtime
Runtime
Longest duration
Runtime
Relevance
Relevance
Listing
Universal machining center DMG MORI DMU 95 MONOBLOCK
Universal machining center DMG MORI DMU 95 MONOBLOCK
Universal machining center DMG MORI DMU 95 MONOBLOCK
Universal machining center DMG MORI DMU 95 MONOBLOCK
Universal machining center DMG MORI DMU 95 MONOBLOCK
Universal machining center DMG MORI DMU 95 MONOBLOCK
Universal machining center DMG MORI DMU 95 MONOBLOCK
Universal machining center DMG MORI DMU 95 MONOBLOCK
Universal machining center DMG MORI DMU 95 MONOBLOCK
Universal machining center DMG MORI DMU 95 MONOBLOCK
Universal machining center DMG MORI DMU 95 MONOBLOCK
Universal machining center DMG MORI DMU 95 MONOBLOCK
more images
France Malakoff
896 km

Universal machining center
DMG MORIDMU 95 MONOBLOCK

Certified Dealer
Call
Listing
Vertical machining center HARDINGE Bridgeport XR-760
Vertical machining center HARDINGE Bridgeport XR-760
Vertical machining center HARDINGE Bridgeport XR-760
Vertical machining center HARDINGE Bridgeport XR-760
Vertical machining center HARDINGE Bridgeport XR-760
Vertical machining center HARDINGE Bridgeport XR-760
Vertical machining center HARDINGE Bridgeport XR-760
more images
United Kingdom Thurmaston
486 km

Vertical machining center
HARDINGE BridgeportXR-760

Certified Dealer
Call
Listing
Milling machining centers - vertical DOOSAN DNM 6700
Milling machining centers - vertical DOOSAN DNM 6700
Milling machining centers - vertical DOOSAN DNM 6700
Milling machining centers - vertical DOOSAN DNM 6700
Milling machining centers - vertical DOOSAN DNM 6700
Milling machining centers - vertical DOOSAN DNM 6700
Milling machining centers - vertical DOOSAN DNM 6700
Milling machining centers - vertical DOOSAN DNM 6700
more images
Hattingen
1,069 km

Milling machining centers - vertical
DOOSANDNM 6700

Certified Dealer
Call
Listing
Horizontal machining center Starrag NB251
Horizontal machining center Starrag NB251
Horizontal machining center Starrag NB251
Horizontal machining center Starrag NB251
more images
United Kingdom United Kingdom
381 km

Horizontal machining center
StarragNB251

Call
Listing
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
CNC turning and milling center JOHNFORD SV-48H “Super Vertical” CNC Vertical Mac
more images
United Kingdom Rowley Regis
427 km

CNC turning and milling center
JOHNFORDSV-48H “Super Vertical” CNC Vertical Mac

Call
Listing
Vertical machining center FANUC ROBODRILL α-D21MiB5
Vertical machining center FANUC ROBODRILL α-D21MiB5
Vertical machining center FANUC ROBODRILL α-D21MiB5
Vertical machining center FANUC ROBODRILL α-D21MiB5
more images
United Kingdom United Kingdom
381 km

Vertical machining center
FANUCROBODRILL α-D21MiB5

Call
Listing
CNc 5 axis vertical machining center Mazak VTC-800/30SR
CNc 5 axis vertical machining center Mazak VTC-800/30SR
CNc 5 axis vertical machining center Mazak VTC-800/30SR
CNc 5 axis vertical machining center Mazak VTC-800/30SR
CNc 5 axis vertical machining center Mazak VTC-800/30SR
CNc 5 axis vertical machining center Mazak VTC-800/30SR
CNc 5 axis vertical machining center Mazak VTC-800/30SR
CNc 5 axis vertical machining center Mazak VTC-800/30SR
more images
United Kingdom Thurmaston
486 km

CNc 5 axis vertical machining center
MazakVTC-800/30SR

Certified Dealer
Call
Listing
CNC turning and milling center HWACHEON HI Eco 31A CNC Lathe
CNC turning and milling center HWACHEON HI Eco 31A CNC Lathe
CNC turning and milling center HWACHEON HI Eco 31A CNC Lathe
CNC turning and milling center HWACHEON HI Eco 31A CNC Lathe
CNC turning and milling center HWACHEON HI Eco 31A CNC Lathe
CNC turning and milling center HWACHEON HI Eco 31A CNC Lathe
CNC turning and milling center HWACHEON HI Eco 31A CNC Lathe
CNC turning and milling center HWACHEON HI Eco 31A CNC Lathe
CNC turning and milling center HWACHEON HI Eco 31A CNC Lathe
CNC turning and milling center HWACHEON HI Eco 31A CNC Lathe
CNC turning and milling center HWACHEON HI Eco 31A CNC Lathe
CNC turning and milling center HWACHEON HI Eco 31A CNC Lathe
more images
United Kingdom United Kingdom
472 km

CNC turning and milling center
HWACHEONHI Eco 31A CNC Lathe

Call
Auction
Center grinding machine Henninger ZS 160
Center grinding machine Henninger ZS 160
Center grinding machine Henninger ZS 160
Center grinding machine Henninger ZS 160
Center grinding machine Henninger ZS 160
Center grinding machine Henninger ZS 160
Center grinding machine Henninger ZS 160
Center grinding machine Henninger ZS 160
Center grinding machine Henninger ZS 160
Center grinding machine Henninger ZS 160
Center grinding machine Henninger ZS 160
Center grinding machine Henninger ZS 160
Center grinding machine Henninger ZS 160
Center grinding machine Henninger ZS 160
Center grinding machine Henninger ZS 160
Ends in 
d  h  min  s  Auction ended
Germany Baden-Württemberg
1,350 km

Center grinding machine
HenningerZS 160

buyer-protection
Auction
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Ends in 
d  h  min  s  Auction ended
Germany Nordrhein-Westfalen
1,075 km

Vertical machining center
KondiaB 500

buyer-protection
Listing
Center lathe TRENS SN32 Classic
Center lathe TRENS SN32 Classic
Center lathe TRENS SN32 Classic
Center lathe TRENS SN32 Classic
Center lathe TRENS SN32 Classic
Center lathe TRENS SN32 Classic
Center lathe TRENS SN32 Classic
more images
Germany Haiger
1,162 km

Center lathe
TRENSSN32 Classic

Call
Listing
Horizontal machining center mori seiki SH50
Horizontal machining center mori seiki SH50
Horizontal machining center mori seiki SH50
Horizontal machining center mori seiki SH50
Horizontal machining center mori seiki SH50
Horizontal machining center mori seiki SH50
more images
France Courbevoie
888 km

Horizontal machining center
mori seikiSH50

Call
Auction
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Vertical machining center Kondia B 500
Ends in 
d  h  min  s  Auction ended
Germany Nordrhein-Westfalen
1,075 km

Vertical machining center
KondiaB 500

buyer-protection
Listing
CNC turning and milling center DOOSAN Puma 5100 XLMB
CNC turning and milling center DOOSAN Puma 5100 XLMB
CNC turning and milling center DOOSAN Puma 5100 XLMB
CNC turning and milling center DOOSAN Puma 5100 XLMB
CNC turning and milling center DOOSAN Puma 5100 XLMB
CNC turning and milling center DOOSAN Puma 5100 XLMB
CNC turning and milling center DOOSAN Puma 5100 XLMB
CNC turning and milling center DOOSAN Puma 5100 XLMB
CNC turning and milling center DOOSAN Puma 5100 XLMB
more images
United Kingdom Thurmaston
486 km

CNC turning and milling center
DOOSANPuma 5100 XLMB

Certified Dealer
Call
Listing
Milling machining centers - vertical TAKUMI H10
Milling machining centers - vertical TAKUMI H10
Milling machining centers - vertical TAKUMI H10
Milling machining centers - vertical TAKUMI H10
Milling machining centers - vertical TAKUMI H10
Milling machining centers - vertical TAKUMI H10
Milling machining centers - vertical TAKUMI H10
Milling machining centers - vertical TAKUMI H10
Milling machining centers - vertical TAKUMI H10
Milling machining centers - vertical TAKUMI H10
more images
Netherlands Wilbertoord
967 km

Milling machining centers - vertical
TAKUMIH10

Call
Listing
Milling machining centers - vertical Hartford MVP16
Milling machining centers - vertical Hartford MVP16
Milling machining centers - vertical Hartford MVP16
Milling machining centers - vertical Hartford MVP16
Milling machining centers - vertical Hartford MVP16
Milling machining centers - vertical Hartford MVP16
Milling machining centers - vertical Hartford MVP16
Milling machining centers - vertical Hartford MVP16
Milling machining centers - vertical Hartford MVP16
Milling machining centers - vertical Hartford MVP16
more images
Netherlands Wilbertoord
967 km

Milling machining centers - vertical
HartfordMVP16

Call
Listing
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
CNC Horizontal Machine centers  SCM Record 110 AL TVN Prisma 2006 SCM Record 110 AL TVN Prisma
more images
Netherlands Wijchen
961 km

CNC Horizontal Machine centers SCM Record 110 AL TVN Prisma 2006
SCMRecord 110 AL TVN Prisma

Certified Dealer
Call
Listing
Milling machining centers - vertical DMG DMU 70 Evo Linear
Milling machining centers - vertical DMG DMU 70 Evo Linear
Milling machining centers - vertical DMG DMU 70 Evo Linear
Milling machining centers - vertical DMG DMU 70 Evo Linear
Milling machining centers - vertical DMG DMU 70 Evo Linear
Milling machining centers - vertical DMG DMU 70 Evo Linear
Milling machining centers - vertical DMG DMU 70 Evo Linear
Milling machining centers - vertical DMG DMU 70 Evo Linear
Milling machining centers - vertical DMG DMU 70 Evo Linear
Milling machining centers - vertical DMG DMU 70 Evo Linear
more images
Netherlands Wilbertoord
967 km

Milling machining centers - vertical
DMGDMU 70 Evo Linear

Call
Listing
Vertical machining center HURCO VMX30i
Vertical machining center HURCO VMX30i
Vertical machining center HURCO VMX30i
more images
United Kingdom Thurmaston
486 km

Vertical machining center
HURCOVMX30i

Certified Dealer
Call
Clickout
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Mazak MT-V-515 Vertical CNC Machining Center Mazak MT-V-515
Belgium Deinze
847 km

Mazak MT-V-515 Vertical CNC Machining Center
MazakMT-V-515

Listing
Vertical machining center DOOSAN DNM 6700
Vertical machining center DOOSAN DNM 6700
Vertical machining center DOOSAN DNM 6700
Vertical machining center DOOSAN DNM 6700
Vertical machining center DOOSAN DNM 6700
Vertical machining center DOOSAN DNM 6700
Vertical machining center DOOSAN DNM 6700
Vertical machining center DOOSAN DNM 6700
Vertical machining center DOOSAN DNM 6700
more images
United Kingdom Thurmaston
486 km

Vertical machining center
DOOSANDNM 6700

Certified Dealer
Call
Siegel

Trust Seal

Dealers certified through Machineseeker

Trust Seal
Listing
Milling machining centers - vertical TAKUMI VC1052
Milling machining centers - vertical TAKUMI VC1052
Milling machining centers - vertical TAKUMI VC1052
Milling machining centers - vertical TAKUMI VC1052
Milling machining centers - vertical TAKUMI VC1052
Milling machining centers - vertical TAKUMI VC1052
more images
Netherlands Wilbertoord
967 km

Milling machining centers - vertical
TAKUMIVC1052

Call
Listing
Machining Center - Horizontal GROB-WERKE G 840
Machining Center - Horizontal GROB-WERKE G 840
Machining Center - Horizontal GROB-WERKE G 840
Machining Center - Horizontal GROB-WERKE G 840
Machining Center - Horizontal GROB-WERKE G 840
Machining Center - Horizontal GROB-WERKE G 840
Machining Center - Horizontal GROB-WERKE G 840
Machining Center - Horizontal GROB-WERKE G 840
Machining Center - Horizontal GROB-WERKE G 840
more images
Germany Germany
1,293 km

Machining Center - Horizontal
GROB-WERKEG 840

Certified Dealer
Call
Listing
Machining center DMG MORI DMU90P duoBLOCK Deckel Maho DMU90P duoBLOCK
Machining center DMG MORI DMU90P duoBLOCK Deckel Maho DMU90P duoBLOCK
Machining center DMG MORI DMU90P duoBLOCK Deckel Maho DMU90P duoBLOCK
Machining center DMG MORI DMU90P duoBLOCK Deckel Maho DMU90P duoBLOCK
Machining center DMG MORI DMU90P duoBLOCK Deckel Maho DMU90P duoBLOCK
Machining center DMG MORI DMU90P duoBLOCK Deckel Maho DMU90P duoBLOCK
Machining center DMG MORI DMU90P duoBLOCK Deckel Maho DMU90P duoBLOCK
Machining center DMG MORI DMU90P duoBLOCK Deckel Maho DMU90P duoBLOCK
Machining center DMG MORI DMU90P duoBLOCK Deckel Maho DMU90P duoBLOCK
more images
Germany Nördlingen
1,400 km

Machining center DMG MORI DMU90P duoBLOCK
Deckel MahoDMU90P duoBLOCK

Certified Dealer
Call
Listing
Vertical machining center XYZ Machine Tools 1060 HS
Vertical machining center XYZ Machine Tools 1060 HS
Vertical machining center XYZ Machine Tools 1060 HS
Vertical machining center XYZ Machine Tools 1060 HS
Vertical machining center XYZ Machine Tools 1060 HS
Vertical machining center XYZ Machine Tools 1060 HS
Vertical machining center XYZ Machine Tools 1060 HS
more images
United Kingdom Thurmaston
486 km

Vertical machining center
XYZ Machine Tools1060 HS

Certified Dealer
Call

This may be of interest to you

Machineseeker Auctions

Sales with maximum attention: Selected auction highlights

Machinseeker Olympic Games

Olympic Games: Machineseeker supports “Team Germany” in Paris

Machineseeker Group Aquire Gebrauchtmaschinen.de Used-machines.com

Machineseeker Group acquires the platforms used-machines.com and Gebrauchtmaschinen.de

EHF Champions League Sponsoring

For the third time in a row: Machineseeker is title sponsor of the EHF Champions League

Machineseeker No. 1 Marketplace

Why Machineseeker Remains Number One

Tricks for buying used machines

10 valuable tricks for buying used machines online