MikeQ Posted February 11 Share Posted February 11 (edited) Hello I’ve had my Minicraft MB450 bench sander for 30yrs but the motor is on its last legs. https://www.worthpoint.com/worthopedia/minicraft-mb450-mb-450-bench-sander-267694901 Needs a flick to get it going. Could be the commutator/brushes. Makes a screeching noise despite blowing it out quitr often with compressed air. Anyone had similar issues and does anyone know of a drop in motor replacement? Must say, its been absolutely fantastic value over the years. Mike Edited February 11 by MikeQ 1 Quote Link to comment Share on other sites More sharing options...
Andy Stephenson Posted February 11 Share Posted February 11 The screaming noise is likely lack of lubrication in the bearings. You may have to dismantle it to get to the brushes. If you can't get a direct replacement from the manufacturer then there are online suppliers, you may need to supply measurements if they don't recognise the make. Quote Link to comment Share on other sites More sharing options...
FlyinFlynn Posted February 12 Share Posted February 12 ! reckon you will find a bog standard mabuchi 540 inside.....cheap as chips. If you decide to replace rather than repair I can recommend the Parkside one although it is a bit bigger than the minicraft one but the table is inclinable and it has speed control. 2 Quote Link to comment Share on other sites More sharing options...
MikeQ Posted March 4 Author Share Posted March 4 (edited) Hello Minicraft good as new. It was an RS 550 motor on examination. Closest I could get at reasonable price was this one … https://www.amazon.co.uk/dp/B07GYQT8SD?ref=ppx_yo2ov_dt_b_fed_asin_title Drops right in. Windings must be different to original as its about twice as fast and seems to want to take off at top speed 🤣 Anyway, sounds and runs super smooth now, at low to medium speed 😃 Edited March 4 by MikeQ Quote Link to comment Share on other sites More sharing options...
FlyinFlynn Posted March 4 Share Posted March 4 2 hours ago, MikeQ said: Hello Minicraft good as new. It was an RS 550 motor on examination. Closest I could get at reasonable price was this one … https://www.amazon.co.uk/dp/B07GYQT8SD?ref=ppx_yo2ov_dt_b_fed_asin_title Drops right in. Windings must be different to original as its about twice as fast and seems to want to take off at top speed 🤣 Anyway, sounds and runs super smooth now, at low to medium speed 😃 Electric Screwdriver, 22000 RPM 😵 Glad you got it fixed. 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.