Delta DL40 Speed Control Board Fuse

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Forum topic by chrismusaf posted 06-22-2016 08:38 PM 1343 views 0 times favorited 10 replies Add to Favorites Watch
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4 posts in 911 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!

10 replies so far

View Wildwood's profile


2476 posts in 2337 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 911 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


2476 posts in 2337 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 Woodknack's profile


12431 posts in 2582 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

-- Rick M,

View MrUnix's profile


7050 posts in 2401 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 - In Dog I trust... everything else is questionable

View MadMark's profile


979 posts in 1655 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


2476 posts in 2337 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


12433 posts in 3957 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 911 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.

View Tutor's profile


1 post in 313 days

#10 posted 02-04-2018 09:35 PM

I just developed a problem with my dl40 controller
If yours is like mine the fuse is ceramic 20 amp 240 v
I will start component testing tomorrow but not seeing any help out there for this control unit… if I find any I will post!
And would appreciate everyone doing same

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