Delta DL40 Speed Control Board Fuse

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Forum topic by chrismusaf posted 06-22-2016 08:38 PM 430 views 0 times favorited 9 replies Add to Favorites Watch
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4 posts in 126 days

06-22-2016 08:38 PM

Topic tags/keywords: delta lathe dl40 speed control motor fuse question

Hi everyone,

I volunteer at a wood shop on a military base. We have an old Delta DL40 lathe, model 46-401, and I’m trying to repair the motor speed control board. I know they’re notorious for failing, but we don’t have a lot of resources. I found a burnt transistor on the board, but the board is missing the F1 fuse. Does anyone have this model who can tell me what type of fuse should be there? Thanks!

9 replies so far

View Wildwood's profile


1848 posts in 1552 days

#1 posted 06-23-2016 03:17 PM

Delta DL-40 don’t think have a schematic in the manual.

If you can find the controller model and S/N inside the cover you can usually find a replacement available.

If have electronics shop aboard the base could have them take a look at it. They might even have the part or can tell you where to buy one.

-- Bill

View chrismusaf's profile


4 posts in 126 days

#2 posted 06-23-2016 05:43 PM

Thanks, but I have the manual. I’m an electrical engineer, so I’m the guy taking a look at it. I’ve seen a few people on here that have this lathe, so I was hoping someone could tell me what F1 is. Unfortunately, there are no markings on the board, and Delta says that they don’t have any drawings or schematics. If I can’t repair the board, I’ll look into getting an AC motor and VFC controller.

View Wildwood's profile


1848 posts in 1552 days

#3 posted 06-23-2016 07:39 PM

How was I to know you are an electrical engineer? Message board gurus give us smell a-figuring; need it to sniff this kind of stuff out!

Know people with that lathe took speed control unit to a repair shop and tech had them fixed in very short time. Delta company sold a couple of times since that lathe came out.

Might have better luck with new motor & VFC controller.

Sorry for no help good luck with it!

-- Bill

View Rick M.'s profile

Rick M.

7678 posts in 1797 days

#4 posted 06-24-2016 10:01 PM

Stanley/Black&Decker destroyed all that stuff (reference material, extra parts, castings, etc.) during their ownership of Delta so the company is starting over, might be a tough part to find.

I’m not very familiar with that particular lathe but I believe it is a DC motor. Is it feasible to use a different controller board, like an MC60?

edit; may or may not help


View MrUnix's profile (online now)


4022 posts in 1616 days

#5 posted 06-24-2016 10:07 PM

What type of fuse? A little standard cartridge type? Or is it something like a MOV (I hate them things)? I can’t find a parts diagram for the board, so a picture would be helpful.


-- Brad in FL - To be old and wise, you must first be young and stupid

View MadMark's profile


965 posts in 870 days

#6 posted 06-24-2016 10:07 PM

F1 = Fuse 1, put in a piece of 30ga for every 2A needed …


-- Madmark -

View Wildwood's profile


1848 posts in 1552 days

#7 posted 06-25-2016 01:42 PM

If knew what I was doing (I don’t) would cruse sites like this to find a replacement speed controller; if could not find the right fuse. Yes seems a waste when garden variety fuse might only cost a buck or less.

Good luck with it!

-- Bill

View lew's profile


11263 posts in 3173 days

#8 posted 06-25-2016 11:57 PM

Found this, although not much help-

A picture might be helpful in determining the type. Replaceable fuses generally have a number/code on them that could be useful in tracking down what you need. I found this PDF that says there are a total of 3 fuses in that controller. “F1” is the only one that’s “customer replaceable”- I take that as a challenge.

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View chrismusaf's profile


4 posts in 126 days

#9 posted 06-29-2016 05:47 PM

lew! Awesome sleuthing there. Having a part number is a HUGE help. I know it’s just a basic cartridge fuse, so if I can get a current rating, it should work.

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