unity gripper left code

left_grip.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class left_grip : MonoBehaviour
{

    public GameObject grip1;
    public float mSpeed1;
    private Rigidbody rbody1;
    private int start_position;
    private float input;
    private int outerLimit, innerLimit;
    // Use this for initialization
    void Start()
    {
        innerLimit = 30;
        outerLimit = 0;
        mSpeed1 = 10f;
        start_position = outerLimit;
        //rbody1 = GetComponent<Rigidbody>();
    }
    // Update is called once per frame
    void Update()
    {
        //rbody1.AddForce(0f, 0f, -1 * mSpeed1 * Input.GetAxis("Horizontal") * Time.deltaTime);
        input = Input.GetAxis("Horizontal");
        if (input != 0)
        {
            if (input > 0)
            {
                start_position++;
            }
            else if (input < 0)
            {
                start_position--;
            }
            if (start_position >= outerLimit && start_position <= innerLimit)
            {
                transform.Translate(1 * Vector3.back * Input.GetAxis("Horizontal") * Time.deltaTime);
            }
            if(start_position > innerLimit)
            {
                start_position = innerLimit;
            }else if(start_position < outerLimit)
            {
                start_position = outerLimit;
            }


        }
    }
  
}