Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

DC motor opening a drawer

Status
Not open for further replies.

crf250rider14

Newbie level 4
Joined
May 15, 2011
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,331
Hello all, this is my first post and I must say, this is a great forum!
Ok, so I have a small wooden drawer about 6 inches wide and 10 inches long. Which is under a shelf. The drawer rests on runners under it. But now I want to hook up a small 12v dc motor from radio shack. I found a way to make the motor go in both directions using a DPDT switch. Now how would I use the dc motor to make the drawer going back and forth?
Hopefully I made this clear enough to understand.
Any help will be greatly appreaciated.
Thanks.
 

kak111

Advanced Member level 4
Joined
Mar 30, 2011
Messages
1,366
Helped
933
Reputation
1,868
Reaction score
907
Trophy points
1,413
Location
Finland
Activity points
10,942
Fix a nut to the drawer and thread bar to motor axle. Motor fixed to shelf.
If your motor is torqueless for that, use gearbox.
 
Last edited:

crf250rider14

Newbie level 4
Joined
May 15, 2011
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,331
Wow thanks for the fast response! What do you mean by a threaded bar? I would like to keep the motor stationary and have it push the drawer open. I was thinking about something that was grooved like you said. Could I buy the bar somewhere? Or would I have to go to a machine shop and have it made up?
Thanks again for your help.
 

kak111

Advanced Member level 4
Joined
Mar 30, 2011
Messages
1,366
Helped
933
Reputation
1,868
Reaction score
907
Trophy points
1,413
Location
Finland
Activity points
10,942
Threaded bar you should find in good hardware store.
They have those bars from 4mm......30mm ( inches ???) for about 2$ / m ( 4mm)

Hope you get drawer automation work.
 

crf250rider14

Newbie level 4
Joined
May 15, 2011
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,331
Hmmm. I do not really understand the idea of the threaded bar. If I put a nut into the wood of the back of the box. And the other end connected to the motor. And I turn the motor on wouldn't it just go threw the nut? It would not pull or push the drawer...
Maybe i am not understanding the whole concept that your trying to explain.
 

kak111

Advanced Member level 4
Joined
Mar 30, 2011
Messages
1,366
Helped
933
Reputation
1,868
Reaction score
907
Trophy points
1,413
Location
Finland
Activity points
10,942
Here is the principle.
You can locate motor as you like.



KAK

You can place the motor also to the right end of the threadbar ( in pict. )
ie motor is located back the shelf. ( Make only needed parts for fasten the motor
to the chassis.)
 
Last edited:

crf250rider14

Newbie level 4
Joined
May 15, 2011
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,331
I see. It makes more sense now. Hopefully I did not put you through to much trouble making the diagram. I'll let you know how it turns out.

---------- Post added at 19:40 ---------- Previous post was at 19:29 ----------

One more question, using the design you made, will the threaded bar be sticking out when the drawer is closed?
 

alexan_e

Administrator
Joined
Mar 16, 2008
Messages
11,895
Helped
2,021
Reputation
4,158
Reaction score
2,031
Trophy points
1,393
Location
Greece
Activity points
64,377
If the drawer moves to the left to open then the threaded bar will be inside the drawer, suppose that the above diagram is in closed position and the front side is the left side

Alex
 

crf250rider14

Newbie level 4
Joined
May 15, 2011
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,331
Ohhhh. That would probably work well then.
I will have to try it.
 

thunderboympm

Full Member level 5
Joined
Sep 17, 2007
Messages
244
Helped
32
Reputation
64
Reaction score
29
Trophy points
1,308
Location
Malappuram, India
Activity points
2,469
if your rack is smooth enough . You may chose the thread also. I mean the wool. It will be fast compared to thread bar system
 

crf250rider14

Newbie level 4
Joined
May 15, 2011
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,331
One more question, the drawer is fairly small, what size motor would work well opening and closing it? I just bought a 9-18v dc motor from radio shack. You think this is good or need bigger?
 

alexan_e

Administrator
Joined
Mar 16, 2008
Messages
11,895
Helped
2,021
Reputation
4,158
Reaction score
2,031
Trophy points
1,393
Location
Greece
Activity points
64,377
I have no idea of the mechanic calculations needed and even if i knew them there are also too many unknown factors like how easy the drawer slides, the weight , the thread step per revolution, the motor torgue etc.
The only answer I can give is to try it and see if it works, if not you need a stronger motor.

Alex
 

kak111

Advanced Member level 4
Joined
Mar 30, 2011
Messages
1,366
Helped
933
Reputation
1,868
Reaction score
907
Trophy points
1,413
Location
Finland
Activity points
10,942
Do a small test.
Take a nut and bolt , same size you think to use. ( start with 4...5mm )
Attach bolt to motor axle with piece of plastic or rubber tube
and check what is the force motor can give via nut.

Regards KAK
 

crf250rider14

Newbie level 4
Joined
May 15, 2011
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,331
Hey do you know what websites sell gearboxs for small motors?
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top