how i increment a variable

how can I smoothly increase the Hingle Joint TargetPosition parameter, let's say from 0 to 50, there is no further, I tried to use MoreTowards, but I could not, I will be glad to help

 

Can you post up your code, will give everyone a better chance at helping you.

If the target position is just a value, I wouldn't use movetowards to pass it onto the hinge joint.

 

so, I need to get the value 7 at a certain speed

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Mehanics : MonoBehaviour
6. {
7.     public HingeJoint joint_1;
8.     public GameObject gm_1;
9.      JointSpring springjoint;
10.  
11.  
12. void Start()
13. {
14.     joint_1 = gm_1.GetComponent<HingeJoint>();
15.     springjoint = joint_1.spring;
16. }
17.     void FixedUpdate()
18.     {
19.         if(Input.GetKey(KeyCode.T))
20.         {
21.             springjoint.targetPosition = 7;
22.             joint_1.spring = springjoint;
23.         }
24.     }
25. }