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Delta 40-601 SS rehab help

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Forum topic by MrUnix posted 06-21-2014 09:12 PM 659 views 0 times favorited 9 replies Add to Favorites Watch
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MrUnix

506 posts in 857 days


06-21-2014 09:12 PM

A couple of weekends ago at a yard sale, I ran across a Delta 40-601 18” scroll saw that I couldn’t resist taking home with me. It worked, but it couldn’t keep a constant speed and varied from dead slow to super fast. The PO told me that it had a bad speed sensor and had already yanked it out (it was sitting on top of the machine). Other than that, it was in great shape, had it’s original metal stand, a quick change kit (new – still in the box) along with about a hundred various blades (most still new in unopened packages). For $35 I figured the blades and quick change kit alone were worth it.

So, I got it home and started looking for some place to get a new sensor. Doing the research, I noticed that the majority of speed problems with these saws was not the sensor, but the ‘speed control rotor’ that the sensor works with to determine rotational speed. Seems they were made of some kind of bakelite material and had a habit of breaking apart. I got around to opening up the machine and sure enough, the rotor was gone, but the metal hub was still there. Grrrr.. Ok, yet another one of those parts that is no longer available. However, I did garner from my digging around the net that the sensor picked up a magnetic pulse from the rotor, so I got a wild idea to try and make one to replace it with.

The rotor is about 2” in diameter, so I got out my 2 1/4” hole saw and threw it in a drill press. I had some scrap hardwood (cherry I believe) and made the circle, then used a forstner bit to make a hole for the metal hub. I dug up a small rare earth magnet in my box-o-junk and embeded it on the edge, glued in the hub and gave it a try.

To my surprise, it worked! But I’m pretty sure it’s running much faster than what the speed indicator tells me, and maxed out, the thing feels like it wants to explode (way, way too fast!). However, the slowest speed it runs at is just about as slow as I would ever want to go, and I can ramp it up for larger stuff if needed.. so all in all, I’m pretty happy with it.

(You can see the speed sensor installed just above the rotor)

Now.. my question for those of you in the know.. I am pretty sure that those original rotors had more than one magnet in them, but not sure how many or how big. I would love to have an original to examine, but if someone who has one of these saws could just tell me what theirs has, that would be fantastic. It’s pretty easy to get to.. you just remove the four screws holding the gear box cover on the bottom and it’s right there. By rotating the gears and using a piece of metal, it should be pretty easy to figure out how many embedded magnets are in the rotor.

Any help would be GREATLY appreciated!!

Cheers,
Brad

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


9 replies so far

View OldWrangler's profile

OldWrangler

559 posts in 252 days


#1 posted 06-21-2014 09:29 PM

Go to eReplacementParts.com and put in Delta Scroll Saw 40-601. They probably have the part and the4y also have a schemematic of the machine that might help. Great people and if they don’t have a part, they will find one. Try’em.

Download Diagram Fig # Part # Img Part Name Availability Price Qty 1 430031020002
Yoke
Ships in 15 – 21 business days
$229.62
2 901041500202
Set Screw Obsolete – Not Available
Discontinued
$0.00 N/A
3 430031060001
Pivot Shaft
Ships in 15 – 21 business days
$35.35
5 430034120001

Screw Assy
Ships in 15 – 21 business days
$9.06
6 430031050001

Sleeve
Ships in 15 – 21 business days
$1.28
7 905010131507

Roll Pin
Ships in 15 – 21 business days
$1.18
8 904152231506
Retaining Ring
Ships in 15 – 21 business days
$1.18
9 961030102859

Grommet
Ships in 15 – 21 business days
$3.65
10 430030890001

Blade Support Obsolete – Not Available
Discontinued
$0.00 N/A
11 901030103318S

Screw
In stock
3 available
$1.44
12 430030270002

Top Blade Clamp
Ships in 15 – 21 business days
$21.07
13 430030790002

Blade Clamp Nut
In stock
3 available
$11.57
14 905010120303
Roll Pin Obsolete – Not Available
Discontinued
$0.00 N/A
15 905010102708

Roll Pin
Ships in 15 – 21 business days
$1.51
16 908250131439

O-Ring
In stock
2 available
$2.39
Fig # Part # Img Part Name Availability Price
17 430030270003

Bottom Blade Clamp
Ships in 15 – 21 business days
$10.32
18 430030890003
Support Arm
Ships in 15 – 21 business days
$144.13
19 422250680001
Lock Knob Obsolete – Not Available
Discontinued
$0.00 N/A
21 901030100760

Cap Screw
In stock
1 available
$2.70
22 491957-00

Lock Washer Obsolete – Not Available
Discontinued
$0.00 N/A
23 901030103318S

Screw
In stock
3 available
$1.44
24 438010040080
Cable Clamp 3/8
Ships in 15 – 21 business days
$1.18
25 430030610001
Chip Blower Tube
Ships in 15 – 21 business days
$6.12
27 928060231012
Washer Obsolete – Not Available
Discontinued
$0.00 N/A
29 901030103318S

Screw
In stock
3 available
$1.44
30 430030050002
Base
Ships in 15 – 21 business days
$937.69
31 430020790001
Retainer
Ships in 15 – 21 business days
$157.67
32 908250131439

O-Ring
In stock
2 available
$2.39
33 430030380001

Bellows
Ships in 15 – 21 business days
$19.79
34 430030380002
Flapper Valve
Ships in 15 – 21 business days
$12.30
Fig # Part # Img Part Name Availability Price
35 430030790004
Bellows Retainer Obsolete – Not Available
Discontinued
$0.00 N/A
36 901030103318S

Screw
In stock
3 available
$1.44
37 430030310001
Gear Cover
Ships in 15 – 21 business days
$12.25
38 901030103318S

Screw
In stock
3 available
$1.44
39 400061310022

Speed Sensor
Ships in 15 – 21 business days
$416.74
40 901041509428S

Set Screw
Ships in 15 – 21 business days
$1.65
43 901030103318S

Screw
In stock
3 available
$1.44
45 901030408015S

Cap Screw
In stock
5 available
$2.54
46 904010101614S

Steel Washer
In stock
5 available
$1.51
47 430030550001

Blade Back Up Guide Obsolete – Not Available
Discontinued
$0.00 N/A
48 901030408015S

Cap Screw
In stock
5 available
$2.54
49 904010101614S

Steel Washer
In stock
5 available
$1.51
50 430020270005S

Hold Down Spring
In stock
2 available
$15.53
51 901041900207S

Set Screw
Ships in 15 – 21 business days
$2.54
52 902020401306

Square Nut
In stock
1 available
$1.28
Fig # Part # Img Part Name Availability Price
54 902020401303S

Square Nut
In stock
1 available
$1.51
55 430031080002

Hold Down Rod
Ships in 15 – 21 business days
$17.90
56 901030100224

Cap Screw
In stock
1 available
$1.51
57 904010101610S

Steel Washer
Ships in 15 – 21 business days
$0.36
58 430030140001

Hold Down Bracket
Ships in 15 – 21 business days
$7.68
59 430030540001

Blade Guard
Ships in 15 – 21 business days
$11.41
61 426020630001S

Table Insert Obsolete – Not Available
Discontinued
$0.00 N/A
64 430030910001
Table
Ships in 15 – 21 business days
$434.95
65 430020270003

Trunnion Clamp
Ships in 15 – 21 business days
$96.95
66 426020950001

Trunnion Half
In stock
8 available
$65.15
67 491957-00

Lock Washer Obsolete – Not Available
Discontinued
$0.00 N/A
68 901030100763

Cap Screw Obsolete – Not Available
Discontinued
$0.00 N/A
69 430033900001
Swivel Assy
Ships in 15 – 21 business days
$140.93
70 901010605770
Cap Screw
Ships in 15 – 21 business days
$0.36
71 1087640

Lock Nut
Ships in 15 – 21 business days
$1.34
Fig # Part # Img Part Name Availability Price
76 904010312925

Spec Washer
In stock
5 available
$11.50
77 951010107802S

Pointer
Ships in 15 – 21 business days
$1.26
78 904010101610S

Steel Washer
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$0.36
79 901030103318S

Screw
In stock
3 available
$1.44
80 420011110003

Stud
Ships in 15 – 21 business days
$4.45
81 904010312925

Spec Washer
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5 available
$11.50
83 438010040075

Strain Relief
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$2.14
101 438020110017

Brush Cap
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$7.96
101 438020070027
Brush Obsolete – Not Available
Discontinued
$0.00 N/A

-- If trees could scream, would we still cut them down. We might, if they did it all the time for no good reason

View MrUnix's profile

MrUnix

506 posts in 857 days


#2 posted 06-21-2014 09:52 PM

Go to eReplacementParts.com and put in Delta Scroll Saw 40-601. They probably have the part and the4y also have a schemematic of the machine that might help. Great people and if they don t have a part, they will find one. Try em.

Been there, done that :)

DeltaMachineryParts, eReplacementPartrs, toolpartsdirect, mikestools, acetool, etc.. all have them either listed as obsolete/not available or “special order”.. I contacted Delta and they told me they are no longer available. I also contacted any supplier that had them listed as available but ‘special order’, and they all told me that they couldn’t get it either. E-bay has been a bust as well. Hence my fabrication above!

Cheers,
Brad

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

View Redoak49's profile

Redoak49

347 posts in 646 days


#3 posted 06-22-2014 04:41 PM

I think that there are a couple of things that you might try. You could put a meter on the output of the sensor and see what happens when the magnet goes by. It maybe a hall effect transistor. You could then tell if the current magnet is working. If it is, I would just try adding a second magnet and see if the speed is in the proper range.

I did some searching online also and you are correct that it does not seem to be available but there are some good pictures of the sensor and the magnet with the wheel.

View kyscroller's profile

kyscroller

41 posts in 551 days


#4 posted 06-23-2014 01:29 AM

Brad I just pulled the bottom off my 40-601 and looked at it. There are no magnets showing but I can tell you it is magnetic all the way around it. They are not very strong though. I held a scroll saw blade lightly while rotating it looking for a non magNetic point on the wheel. Might want to try picking up some of those flexible strip magnet from like Michaels and glue it to the edge and see if that may work better. Hope this helps.

View MrUnix's profile

MrUnix

506 posts in 857 days


#5 posted 06-23-2014 07:11 PM

Brad I just pulled the bottom off my 40-601 and looked at it. There are no magnets showing but I can tell you it is magnetic all the way around it. [...] Hope this helps.”

Thanks a bunch for looking at your machine, however, now I’m totally confused !!!

The sensor obviously picks up some kind of magnetic signal from the rotor, as otherwise my ‘fix’ wouldn’t be working at all.. a continuous magnetic field doesn’t seem like it would offer any input at all to the sensor! Maybe they are just spaced so close to each other that it appears to be continuous.. I dunno. I think my next move is to try and find a way to measure the speed it currently runs at (at the slowest setting) and compare that to what it ‘thinks’ it’s running at via the front indicator (40 SPM). If I can get a ratio (actual vs indicated) then I might be able to figure out how many more magnets it needs. I was hoping this would be a bit easier to figure out!

Cheers,
Brad

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

View nicksmurf111's profile

nicksmurf111

172 posts in 108 days


#6 posted 06-23-2014 08:12 PM

If it’s a hall effect sensor, I think all you need is a chunk of metal. You need to know how many lobes the original had on it. If the original had 4 lobes, and you are trying to use 1, it will run 4 times as fast. Look up how a ignition coil pickup on an 1970’s vehicle works, or even the crank and camshaft sensors on modern vehicles. It’s just a chunk of metal with teeth which induces a very small voltage into the winding.

-- Nicholas

View nicksmurf111's profile

nicksmurf111

172 posts in 108 days


#7 posted 06-23-2014 08:16 PM

I was looking at the picture and there is no indication how many pieces of metal are in the thing.

http://www.mikestools.com/430-03-100-0001-Delta-Speed-Control-Rotor.aspx

This picture on Ebay shows 4 casting marks in the palstic. But I think that’s probably from the mold.

http://www.ebay.com/itm/Speed-Sensor-Rotor-430-03-100-0001-for-Delta-40-601-18-034-Scroll-Saw-/261447031797?nma=true&si=rtX0%252FPwCcl1Ej7FbFyazAGN57TI%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

-- Nicholas

View Rwood's profile

Rwood

1 post in 67 days


#8 posted 07-18-2014 01:07 AM

sounds like I might help. I had two 601’s sold 1 to a guy from work , 3 weeks later his rotor shattered
Took mine off,thinking I could turn one out on lathe .
To count magnets I used one of those hard to reach expandable magnet tools , stuck it on vise held the rotor close ,
Counted 28 pauses . Not very strong mags but easy to count
Thinking I will try hole punching some those flat icebox mags ,not sure how to apply to new rotor

View MrUnix's profile

MrUnix

506 posts in 857 days


#9 posted 07-20-2014 11:53 PM

Counted 28 pauses . Not very strong mags but easy to count
Thinking I will try hole punching some those flat icebox mags ,not sure how to apply to new rotor

Wow..

I know mine is running fast with just 1 magnet.. but I can’t imagine that it’s running 28x fiaster! Even so, it is functional as is and I’ve been giving it a pretty good workout lately. First scroll saw I’ve ever owned and I am having a lot of fun with the thing.

Thanks a zillion for taking the time to check it out. We all finally know the answer to ‘how many magnets’ :) I also like your idea of the fridge magnets and may give that a try to see how it goes. I’m thinking that they could be attached (glued) to the outside edge of the rotor then the whole thing covered with a couple layers of polyurethane or even painted over to help keep them in place. Maybe get fancy and fill in the gaps between magnets with some epoxy or something. Sure would be easier if I had a lathe!

Cheers,
Brad

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

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